Why are two strands of fiber used for a single fiber optic connection:They allow for full-duplex connectivity

Why would a network administrator use the CLI of the Cisco IOS: to add a password to a Cisco network device

Why would a technician enter the command copy startup-config running-config: to copy an existing configuration into RAM

Within a production network, what is the purpose of configuring a switch with a default gateway address: The default gateway address is used to forward packets originating from the switch to remote networks

Your organization is issued the IPv6 prefix of 2001:0000:130F::/48 by your service provider. With this prefix, how many bits are available for your organization to create subnetworks: 16

A ball is held 50 cm in front of a plane mirror. The distance between the ball and its image is: 100 cm

A ball is held 50 cm in front of a plane mirror. The distance between the ball and its image is: 100 cm

A beam of light of wavelength 550 nm traveling in air is incident on a slab of transparent material. The incident beam makes an angle of 40.0° with the normal, and the refracted beam makes an angle of 26.0° with the normal. Find the index of refraction of the material. 1.47

A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction. Is it: Red

A concave mirror forms a real image that is twice the size of the object.If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about: 27 cm

A concave mirror forms a real image that is twice the size of the object.If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about: 27 cm

A converging lens made of crown glass has a focal length of 15.0 cm when it used in air. If lens is immersed in water, what is its focal length? Less than 15.0 cm

A converging lens made of crown glass has a focal length of 15.0 cm when it used in air. If lens is immersed in water, what is its focal length? Less than 15.0 cm

A converging lens of focal length 10.0 cm forms images of objects placed 30.0 cm from the lens. Describe the obtained image. real, inverted, reduced

A converging lens of focal length 10.0 cm forms images of objects placed 10.0 cm from the lens. Describe the obtained image. no correct answer

A converging lens of focal length 10.0 cm forms images of objects placed 5.0 cm from the lens. Describe the obtained image. virtual, upright, increased

A diverging lens of focal length 10.0 cm forms images of objects placed 30.0 cm from the lens. Describe the obtained image. virtual, upright, reduced

A diverging lens of focal length 10.0 cm forms images of objects placed 10.0 cm from the lens. Describe the obtained image. virtual, upright, reduced

A diverging lens of focal length 10.0 cm forms images of objects placed 5.0 cm from the lens. Describe the obtained image. virtual, upright, reduced

A hydrogen atom is in its ground state. Incident on the atom is a photon having an energy of 10.5 eV. What is the result? The photon passes by the atom without interaction

A laser in a compact disc player generates light that has a wavelength of 780 nm in air. Find the speed of this light once it enters the plastic of a compact disc (n = 1.55). 1.94x10⁸ m/s

A light ray containing both blue and red wavelengths is incident at an angle on a slab of glass. Which of the sketch in Figure represents the most likely outcome? C

A light ray of wavelength 589 nm traveling through air is incident on a smooth, flat slab of crown glass at an angle of 30.0° to the normal, as sketched in Figure. Index of refraction for crown glass equals to 1.52. Find the angle of refraction. 19.2°

A linearly polarized light beam is shown on figure:

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm. The distance from the mirror to the image of his nose is: 16cm

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm. The distance from the mirror to the image of his nose is: 16cm

A plane monochromatic light wave is incident on a double-slit as illustrated in Figure. As the viewing screen is moved away from the double slit, what happens to the separation between the interference fringes on the screen? It increases

A plane monochromatic light wave is incident on a double-slit as illustrated in Figure. As the viewing screen is moved away from the double slit, what happens to the separation between the interference fringes on the screen? It increases

A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed: midway between the center of curvature and the mirror

A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed: midway between the center of curvature and the mirror

A proton in a plane electromagnetic wave in vacuum, the ratio E/B of the amplitudes in SI units of the two fields is: the speed of light

A P-type semiconductor is doped to produce one of the following. Will it produce: holes

A pyrometer is all answers are correct

A real image: formed when light rays pass through and diverge from the image point;

A small fish is swimming at a depth d below the surface of a pond. What is the apparent depth of the fish, as viewed from directly overhead? -0.752 d

A sodium surface is illuminated with light having a wavelength of 300 nm. The work function for sodium metal is 2.46 eV. Find the maximum kinetic energy of the ejected photoelectrons. (h= 6.63* 10^-34 J *s, c= 3*10⁸ m/s). 1.67 eV

A source emits monochromatic light of wavelength 495 nm in air. When the light passes through a liquid, its wavelength reduces to 434 nm. What is the liquid’s index of refraction? 1.14

A source emits monochromatic light of wavelength 495 nm in air. When the light passes through a liquid, its wavelength reduces to 434 nm. What is the liquid’s index of refraction? 1.14

A viewing screen is separated from a double-slit source by 1.2 m. The distance between the two slits is 0.030 mm. The second-order bright fringe (m = 2) is 4.5 cm from the center line. Determine the wavelength of the light. 560 nm

A viewing screen is separated from a double-slit source by 1.2 m. The distance between the two slits is 0.030 mm. The second-order bright fringe (m = 2) is 4.5 cm from the center line. Calculate the distance between adjacent bright fringes. 2.2 cm

A virtual image is one: from which light rays diverge but do not pass through

A virtual image: formed when the light rays do not pass through the image point but only appear to diverge from that point;

Alpha particles are nuclei of: Helium

An anti-shoplifting mirror, as shown in Figure, shows an image of a woman who is located 3.0 m from the mirror. The focal length of the mirror is -0.25 m. Find the position of her image. -0.23 m

An anti-shoplifting mirror, as shown in Figure, shows an image of a woman who is located 3.0 m from the mirror. The focal length of the mirror is -0.25 m. Find the magnification of the image. 0.077

An object is located 50.0 cm from a converging lens having a focal length of 15.0 cm. Which of the following statements is true regarding the image formed by the lens? It is real, inverted, and larger than the object

An object is located 50.0 cm from a converging lens having a focal length of 15.0 cm. Which of the following statements is true regarding the image formed by the lens? It is real, inverted, and larger than the object

An polarized light beam incident on a second polarizing sheet, called the analyzer

An unpolarized light beam incident on a first polarizing sheet, called the polarizer

An unpolarized light beam is shown on figure:

An x-ray photon collides with a free electron, and the photon is scattered. During this collision there is conservation of: both momentum and energy

As an object is moved from the center of curvature of a concave mirror toward its focal point its image: remains real and becomes larger

As an object is moved from the center of curvature of a concave mirror toward its focal point its image: remains real and becomes larger

As used in the laws of reflection and refraction, the “normal” direction is: perpendicular to the interface

At what distance in front of a concave mirror must an object be placed so that the image and object are the same size: half a focal length

At what distance in front of a concave mirror must an object be placed so that the image and object are the same size: half a focal length

Atomic number Z equals the number of protons in the nucleus

Blackbody temperature of T = 2 000 K. Determine the wavelength λ_m, which corresponds maximal radiation energy. (Wien's displacement constant b = 2.9 * 10^-3 m* K). 1, 45 microns

Choose correct statement for black body All answers are correct

Choose correct statement for n -type semiconductor majority of charge carriers are electrons, which are n egatively charged

Choose correct statement for the ultraviolet catastrophe all answers are correct

Choose correct statement for the uncertainty principle all answers are correct

Choose the correct answer for the half-life of a radioactive substance There are no correct answers

Classical Newtonian laws of physics are inertial frame covariant under: the Galilean transformations

Describe this picture : Comparison of experimental results and the curve predicted by the Rayleigh–Jeans law for the distribution of blackbody radiation

Determine energy luminosity R_e blackbody if the maximum energy of radiation at the wavelength λ_m = 600 nm. (Wien's displacement constant b = 2.9 × 10^-3 m* K, Stefan–Boltzmann constant σ = 5.670 ×10⁻⁸ W m⁻² K⁻⁴). 3, 1* 10⁷ W/m²

Determine the temperature T of blackbody if the maximum energy of radiation at the wavelength λ_m = 600 nm. (Wien's displacement constant b = 2.9 × 10^-3 m* K). 4833 K

Diffraction at a single slit occurs. Choose the condition of maximum dsinj= (2n+1)l/2;

Diffraction at a single slit occurs. Choose the condition of maximum dsinj= nl/2, n=1,2,3…;

Diffraction at single slit occurs. Choose the condition of minimum dsinj= (2n+1)l/2;

Energy and momentum of photon is respectively: ħω; 2πħ/λ

Figure shows two stars in the constellation Orion. Betelgeuse appears to glow red, whereas Rigel looks blue in color. Which star has a higher surface temperature? Rigel

Find the critical angle for an air–water boundary. (The index of refraction of water is 1.33.) 48.8°

For the hydrogen atom, which series describes electron transitions to the N=1 orbit, the lowest energy electron orbit? Is it the: Lyman series

For the hydrogen atom, which series describes electron transitions to the N = 2 orbit? Is it the: Balmer series

For what value of principle number n electron in H atom have energy -13.6V? n=1

From the window of the furnace is emitted the flow Φ_e = 4 kJ / min. Determine the temperature T of furnace if the area of ​​the window S = 8 cm². (Stefan–Boltzmann constant σ = 5.670 ×10⁻⁸ W m⁻² K⁻⁴). 828 ⁰C

Gauss' law of electricity, Gauss' law of magnetism, Faraday's law of induction, and Amperes' law form the basic equations of electromagnetism. This combination is collectively known as: Maxwell's equations

Heat is transferred from the sun to the earth primarily by: Radiation

How many photons in the visible range (around 550 nm) are emitted every second by a 60-W lightbulb? Only about 10 percent of the total power emitted as radiation by an incandescent lightbulb is in the visible range. 1.7*10¹⁹photons/s

How much energy is needed to ionize hydrogen in the n=3 state? 1.51 eV

If angle of incidence of light equals to the Brewster angle what angle reflected and refracted rays make? 90°

If light is reflected by the surface of a pond it is partially polarized in the plane of the surface of the pond

If materials become superconducting when cooled, any magnetic field will be expelled. This is called: the Meissner effect

If two light waves are coherent: their phase difference is constant

In a laser: the state in which an atom is initially excited is never between two states that are involved in a stimulated emission

In a photoelectric effect experiment no electrons are ejected if the frequency of the incident light is less than A/h, where h is the Planck constant and A is: the minimum energy needed to eject the most energetic electron

In changing from an energy state of -1.51 electron-volts to -3.40 electron-volts, an atom emits a photon whose energy is: 1.89 electron-volts

In order to observe interference in light waves, the following conditions must be met: The sources must be coherent and monochromatic

In radioactive decay, the emission of an electron is characteristic of: Beta decay

In standard quantum mechanics, nature is fundamentally: Probabilistic

In the probabilistic interpretation of wave function , the quantity is: a probability density

In the Rutherford model of the atom, the positive charge is: concentrated in a small central core called the nucleus

In the sun, helium is produced from hydrogen by: fusion

Isotopes are nuclei that contain the same number of protons

Isotopes of an element have different numbers of: Neutrons

It’s … model of atom : Thomson’s

Laser radiation is: all answers are correct

Light can travel from air into water. Some possible paths for the light ray in the water are shown in Figure. Which path will the light most likely follow? C

Light crossing a boundary as it travels from medium 1 to medium 2 is refracted, or bent. The angle of refraction is defined by the relationship:

Light is emitted by hydrogen atoms in the visible range for a hydrogen atom. Its wavelength is 656 nm. What value of n is associated with the light? (RH = 1.097 × 10⁷ m^-1) 3

Newton's rings are result of Interference

Newton's rings are result of Interference

Nucleus of which element has no neutron: Hydrogen

On the picture there is band structure of Insulator

Planck's constant was first introduced in order to obtain a correct theoretical prediction of: the distribution of frequencies occurring in black body radiation

Please find the Compton experiment:

Please find the double-slit experiment:

Please find the experiment for the photoelectric effect:

Please find the Michelson-Morley experiment:

Polaroid sheets are used to obtain polarized light

Rayleigh’s criterion, which is a limiting condition of resolution, states that two images formed by an aperture are just distinguishable if the central maximum of the diffraction pattern for one image falls on the first minimum of the diffraction pattern for the other image.

Show the biconcave lens on this figure: b)

Show the biconvex lens on this figure: a)

Show the converging lenses: a), c), d)

Show the convex-concave lens on this figure: c), e)

Show the diverging lenses: b), e), f)

Show the plano-concave lens on this figure: f)

Show the plano-convex lens on this figure: d)

Snell’s law of refraction states that:

The ⁶⁶Cu (Z = 29) produced in a nuclear bombardment is unstable, changing to ⁶⁶Zn (Z = 30) by the emission of: an electron

The activity of radioactive substance is –dN/dt

The angles at which the diffraction pattern has zero intensity, corresponding to destructive interference, are given by

The anti-particle to an electron is: Positron

The average energy luminosity R_e of Earth surface is 0.54 J / (cm² * min). What should be the Earth's surface temperature T, if we arbitrarily assume that it radiates as a gray body with emissivity coefficient a_T = 0,25? (Stefan–Boltzmann constant σ = 5.670 ×10⁻⁸ W m⁻² K⁻⁴). 9 ⁰C

The condition for constructive interference at point P is

The condition for destructive interference at point P is

The condition for intensity maxima in the interference pattern of a diffraction grating for normal incidence is

The critical angle for which total internal reflection occurs at an interface is given by:

The equation for Brewster’s law:

The farsightedness can be corrected by placing: a converging lens in front of the eye

The idea that electrons revolved in orbits around the nucleus of an atom without radiating energy away from the atom was postulated by: Bohr

The image of an erect candle, formed using a convex mirror, is always: virtual, erect, and smaller than the candle

The image of an erect candle, formed using a convex mirror, is always: virtual, erect, and smaller than the candle

The image, shown in this picture is: Virtual, upright, reduced

The image, shown in this picture is: Virtual, upright, increased

The image, shown in this picture is: real, inverted

The image, shown in this picture is: Virtual, upright, increased

The image, shown in this picture is: virtual, upright, reduced

The image, shown in this picture is: Real, inverted, reduced

The image, shown in this picture is: Virtual, upright, reduces

The index of refraction for water is about 4/3. What happens as a beam of light travels from air into water? c is speed of light. Its speed decreases to (3/4)c, and its wavelength decreases by factor of ¾

The index of refraction n of a medium is defined by the ratio:

The index of refraction of a substance is: the speed of light in vacuum divided by the speed of light in the substance

The intensity at a point in the double-slit interference pattern is

The ionization energy of an atom in its ground state is: the energy required to remove the most energetic electron

The lateral magnification M of an image is defined by equations:

The limiting angle of resolution for a slit of width a is:

The longest wavelength of light that will induce a photoelectric effect in potassium is 564 nm. Calculate the work function for potassium in electron-volts. 2.20eV

The Malus’s law is:

The mass of a nucleus less than the sum of masses of its constituent nucleons

The mirror equation is described by equation:

The n=1 state of hydrogen atom is the ground state, higher values of n correspond to excited states

The nearsightedness can be corrected by placing: a diverging lens in front of the eye

The number of electron states in a shell with principal quantum number n=3 is: 18

The path of ray of light between two point is the path that _______ the travel time Minimizes

The ratio of the focal length of a camera lens to the diameter of the lens is called the f-number of the len

The relation between the disintegration constant λ and the half-life T of a radioactive substance is: λT = ln2

The relation θ_incident = θ_reflected, which applies as a ray of light strikes an interface between two media, is known as: Snell’s law

The resolving power of a diffraction grating in the m th order of the diffraction pattern is

The Schrodinger Equation all answers are correct

The significance of |ψ|2 is probability density

The speed of an electron is measured to be 5.00* 10³ m/s to an accuracy of 0.003 00%. Find the minimum uncertainty in determining the position of this electron(Dirac constant = 1. 055* 10^-34 J *s, m_e= 9.11 * 10^-31 kg). 0.386 mm

The units of index of refraction are: none of these

The wavelength of light beam B is twice the wavelength of light beam B. The energy of a photon in beam A is: half the energy of a photon in beam B

Two ray of light interfere constructively if their path length differs by how much? nl;

Two ray of light interfere constructively if their path length differs by how much? nl;

Two ray of light interfere destructively if their path length differs by how much? (2n+1)l/2;

Wave optics deals with phenomena of interference,polarization,diffraction

Wave optics deals with phenomena of interference,polarization,diffraction

What band is called valence band? Band totally filled with electrons

What cannot we measure in a particle at the same time? the position and the speed

What does this picture show ? Potential-energy diagram of a well of finite height U and length L

What does this picture show ? the Meissner effect

What happens to a light wave when it travels from air into glass? Its frequency remains the same

What happens to a light wave when it travels from air into glass? Its frequency remains the same

What interference pattern was observed by Young in his double slit experiment? Equidistant bright and dark bands

What interference pattern was observed by Young in his double slit experiment? Equidistant bright and dark bands

What is the consequence of Einstein's formula E = mc²? We can transform matter in energy and the other way round

What kind of polarized light is radiated by the Sun? unpolarized light;

What source of radiation is the source of coherent light? Laser

What type of impurities (from the point of view of their valence) is used to get n-semiconductors? With 5 valence electrons

What type of impurities is used to obtain p-type semiconductor? With 3 valence electrons

What value of wavelength is associated with the Lyman series for n = 2? (R_H = 1.097 × 10⁷ m^-1) 1.2 × 10^-7 m

What wavelength (in ) is associated with the Paschen series for n = 4? (R_H = 1.097 × 10⁷ m^-1) 1.9

When a gaseous element is raised to a very high temperature, the atoms emit radiation having discrete wavelengths. The set of vavelengths for a given element is called its atomic spectrum. Two strong components in the atomic spectrum of sodium have wavelengths of 589.00 nm and 589.59 nm. What resolving power must a grating have if these wavelengths are to be distinguished? 999

When a gaseous element is raised to a very high temperature, the atoms emit radiation having discrete wavelengths. The set of vavelengths for a given element is called its atomic spectrum. Two strong components in the atomic spectrum of sodium have wavelengths of 589.00 nm and 589.59 nm. To resolve these lines in the second-order spectrum. How many slits of the grating must be illuminated? 500

When an atom undergoes beta decay, the atomic number of the nucleus: increases by one

When an electromagnetic wave meets a reflecting surface, the direction taken by the reflected wave is determined by: the angle of incidence

When an image of the object is formed by a converging lens, which of the following statements is ALWAYS true? More than one statement may be correct. None of those statements is ALWAYS true

When an image of the object is formed by a converging lens, which of the following statements is ALWAYS true? More than one statement may be correct. None of those statements is ALWAYS true

When ordinary sulfur, 32S (Z = 16), is bombarded with neutrons, the products are 32P (Z = 15) and: protons

When total internal reflection can occur? When light strikes the boundary where the medium beyond is optically less dense

When we divide a wave front into Fresnel zones, the slant height of each cone is longer than preceding one by l/2

When we divide a wave front into Fresnel zones, the slant height of each cone is longer than preceding one by l/2

When you stand in front of a plane mirror, your image is: virtual and the same size as you

Which is the strongest power of the fundamental powers? the nuclear power

Which of the following colors of visible light has the longest wavelength? Is it: Red

Which of the following electromagnetic radiations has photons with the greatest energy? x rays

Which one of the following particles travels at the speed of light? Photons

Which wave has the highest frequency? ultraviolet waves

Whose principle or law states that each point on a wavefront may be considered a new wave source? Is it: Huygen's Principle

Wien’s displacement law The peak of the wavelength distribution shifts to shorter wavelengths as the temperature increases

CCNA 1 R&S ITN Chapter 1 v5.0 Exam Answers 2014

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