Planck's quantum theory is compatible with the experimental data related to which of the following? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. blackbody radiation 2. the photoelectric effect. 3. line spectra emitted by hydrogen gas 4. all of the choices
Planck's quantum theory is compatible with the experimental data related to which of the following? 1234567891011121314151617181920 2122232425262728293031323334353637383940.
Jan 12, 2016
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Planck's quantum theory is compatible with the experimental data related to which of the following?
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1. blackbody radiation
2. the photoelectric effect.
3. line spectra emitted by hydrogen gas
4. all of the choices
Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject electrons from that metal?
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1. infra-red
2. ultra-violet
3. red
4. green
What is the energy associated with a light quantum of wavelength 5.0 x 10-7 m? (h = 6.63 x 10-34 J-s)
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1. 4.0 x 10-19 J
2. 3.3 x 10-19 J
3. 1.5 x 10-19 J
4. 1.7 x 10-19 J
If a monochromatic light beam with quantum energy value of 3.0 eV incident upon a photocell where the work function of the target metal is 1.60 eV, what is the maximum kinetic energy of ejected electrons?
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1. 4.6 eV
2. 4.8 eV
3. 1.4 eV
4. 2.4 eV
Which of the following devices represent(s) a practical application of the photoelectric effect?
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1. hologram
2. camera light intensity meter
3. both of the choices
4. none of the choices
X-ray production occurs in which process?
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1. photons hitting a metal, emitting electrons
2. electrons hitting a metal, emitting photons
3. photons hitting a metal, emitting X-rays
4. electrons hitting a metal and scattering elasticly
Which of the following devices represent(s) a practical application of the photoelectric effect?
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1. hologram
2. camera light intensity meter
3. both of the choices
4. none of the choices
An important use of X-ray diffraction was?
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1. the observation of Compton scattering.
2. determining the structure of the DNA molecule.
3. production of positrons.
4. observation of the photoelectric effect.
Which process cannot occur if only one photon is involved?
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1. pair annihilation
2. pair production
3. the photoelectric effect
4. X-ray production
According to the principle of complementarity, everything acts in a given experiment as if it is either a wave or a particle. In which experiment is the wave aspect exhibited?
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1. the Davisson and Germer experiment
2. the photoelectric effect
3. pair production
4. Compton scattering
The spacing between atoms in KCl crystal is 3.1 x 10-10 m. At what angle from the surface will a beam of 3.14 x 10-11 m X-rays be constructively scattered?
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1. 57 °
2. 2.3 °
3. 90 °
4. 10 °
The "seeing" ability or resolution of radiation is determined by its wavelength. If the size of an atom is approximately 10-10 m, how fast must an electron travel to have a wavelength smaller than that of an atom? (me = 9.1 x 10-31 kg, h = 6.626 x 10-34 J-s)
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1. 7.28 x 106 m/s
2. 3.39 x 106 m/s
3. 1.03 x 106 m/s
4. 5.35 x 105 m/s
The ultraviolet catastrophe predicts that?
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1. all objects should radiate extreme amounts of ultraviolet light.
2. as an object gets hotter its light will change from dull red to blue white.
3. a black body can absorb an infinite amount of radiation if the radiation is in the ultraviolet region.
4. the radiated energy approaches zero as the wavelength approaches zero.
According to Einstein, increasing the brightness of a beam of light without changing its color will increase?
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1. the number of photons.
2. the energy of each photon.
3. the speed of the photons.
4. the frequency of the photons.
Classical theories predict that most of the energy from a black body should be radiated?
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1. as thermal radiation in the infrared region.
2. at the wavelength given by Wien's displacement law.
3. as ultraviolet light.
4. a black body should not radiate.
If a photon is absorbed by an electron, it will give up more energy to that electron if the photon?
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1. is not spread out over many electrons.
2. is moving faster.
3. is moving slower.
4. has a higher frequency.
If an electron has a measured wavelength of 0.85 x 10-10 m, what is its kinetic energy? (h = 6.63 x 10-34 J-s, 1 eV = 1.6 x 10-19 J, and me = 9.11 x 10-31 kg)
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1. 55 eV
2. 104 eV
3. 147 eV
4. 209 eV
A sodium vapor lamp has a power output of 300 W. If 590 nm is the average wavelength of the source, about how many photons are emitted per second? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s and 1 nm = 10-9 m)
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1. 1017
2. 1021
3. 1025
Consider a hollow body with a small hole in one side. If this is a black body, it must?
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1. be filled with gas.
2. emit no light.
3. have black paint on the walls.
4. contain electromagnetic radiation.
What is the de Broglie wavelength of an electron accelerated from rest through a potential difference of 50 V? (h = 6.63 x 10-34 J-s, me = 9.11 x 10-31 kg and 1 eV = 1.67 x 10-19 J)
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1. 1.04 x 10-10 m
2. 1.39 x 10-10 m
3. 1.74 x 10-10 m
4. 8.34 x 10-10 m
X-rays of wavelength of 0.0650 nm undergo Compton scattering from free electrons in carbon. What is the wavelength of photons scattered at 90° relative to the incident beam? (h = 6.63 x 10-34 J-s, me = 9.11 x 10-31 kg, c = 3 x 108 m/s and 1 nm = 10-9 m)
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1. 0.0024 nm
2. 0.0674 nm
3. 0.0687 nm
4. 0.0626 nm
In regard to the Compton scattering experiment with X-rays incident upon a carbon block, as the scattering angle becomes larger, what happens to the magnitude of difference between the incident and scattered wavelengths?
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1. increases
2. decreases
3. remains constant
4. difference is maximum at 45° angle of scatter
Which of the following statements best describes the relation between the quantum theory and the photoelectric effect experiment?
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1. quantum theory explains photoelectric effect
2. photoelectric effect contradicts quantum theory
3. quantum theory has no bearing on photoelectric effect
4. photoelectric effect explains quantum theory
The sun's surface temperature is 5800 K and the peak wavelength in its radiation is 500 nm. What is the surface temperature of a distant star where the peak wavelength is 475 nm?
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1. 5510 K
2. 5626 K
3. 6105 K
4. 6350 K
Light of wavelength 480 nm is incident on a metallic surface with a resultant photoelectric stopping potential of 0.55 V. What is the work function of the metal? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m)
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1. 2.04 eV
2. 3.19 eV
3. 2.59 eV
4. 0.55 eV
If the minimum X-ray wavelength produced is 13.5 x 10-12 m, through what potential are the electrons accelerated in order to generate this radiation? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s and 1 eV = 1.6 x 10-19 J)
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1. 33,000 V
2. 46,040 V
3. 75,000 V
4. 92,080 V
According to Wien's displacement law, if the absolute temperature of a radiating blackbody is tripled, then the peak wavelength emitted will change by what factor?
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1. 1/3
2. 1.0
3. 3.0
4. 9.0
Blue light (λ = 460 nm) is incident on a piece of potassium (Ø = 2.2 eV). What is the maximum kinetic energy of the ejected photoelectrons? (h = 6.626 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J)
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1. 1.0 eV
2. 0.5 eV
3. 0.25 eV
4. 4.9 eV
What is the energy of a photon whose frequency is 6 x 1020 Hz? (h = 6.63 x 10-34 J-s and 1 eV = 1.6 x 10-19 J)
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1. 1.6 MeV
2. 2.5 MeV
3. 3.3 MeV
4. 4.8 MeV
A quantum of radiation has an energy of 2 keV. What is its frequency? (h = 6.63 x 10-34 J-s and 1 eV = 1.6 x 10-19 J)
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1. 3.2 x 1017 Hz
2. 4.8 x 1017 Hz
3. 6.3 x 1017 Hz
4. 7.3 x 1017 Hz
If a quantum of radiation has an energy of 2 keV, what is its wavelength? (h = 6.63 x 10-34 J-s, 1 eV = 1.6 x 10-19 J, c = 3 x 108 m/s and 1 nm = 10-9 m)
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1. 0.32 nm
2. 0.41 nm
3. 0.62 nm
4. 1.02 nm
An ultraviolet light beam having a wavelength of 130 nm is incident on a molybdenum surface with work function of 4.2 eV. What is the stopping potential? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m)
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1. 1.3 V
2. 3.5 V
3. 5.4 V
4. 11.9 V
The Compton experiment demonstrated which of the following when an X-ray photon collides with an electron?
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1. momentum is conserved
2. energy is conserved
3. momentum and energy are both conserved
4. wavelength of scattered photon equals that of incident photon
An electron and a positron both of rest mass 0.57 MeV slowly drift together and annihilate into two gamma ray photons. What is the wavelength of each of the photons?
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1. 1.21 x 10-12 m
2. 2.43 x 10-12 m
3. 4.86 x 10-12 m
4. 9.72 x 10-12 m
A proton (mass = 1.67 x 10-27 kg) has a kinetic energy of 1 MeV. If its momentum is measured with an uncertainty of 1%, what is the minimum uncertainty in its position? (h = 6.626 x 10-34 J-s)
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1. 9.08 x 10-13 m
2. 2.28 x 10-13 m
3. 9.08 x 10-14 m
4. 5.64 x 10-14 m
An electron microscope operates with electrons of kinetic energy 40 keV. What is the wavelength of these electrons? (h = 6.626 x 10-34 J-s, 1 eV = 1.6 x 10-19 J, and me = 9.1 x 10-31 kg)
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1. 0.50 x 10-10 m
2. 7.17 x 10-11 m
3. 6.14 x 10-12 m
4. 3.07 x 10-13 m
How much energy (in eV) does a photon of red light ( λ = 640 nm) have? (h = 6.626 x 10-34 J-s and 1 eV = 1.6 x 10-19 J)
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1. 3.2 eV
2. 2.5 eV
3. 1.9 eV
4. 1.3 eV
In an X-ray diffraction experiment, using X-rays of wavelength λ = 0.5 x 10-10 m, a first-order maximum occurred at 5° off the crystal plane. Find the distance d between crystal planes.
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1. 2.87 x 10-10 m
2. 1.36 x 10-10 m
3. 6.24 x 10-9 m
4. 1.93 x 10-9 m
What is the maximum velocity of a photoelectron emitted from a surface with work function 5 eV when illuminated by 200 nm ultraviolet light? (melectron = 9.1 x 10-31 kg, h = 6.626 x 10-34 J-s, 1 eV = 1.6 x 10-19 J)
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1. 800,080 m/s
2. 652,800 m/s
3. 431,100 m/s
4. 212,200 m/s
A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 0.5 mW. How many photons are emitted each second? (h = 6.626 x 10-34 J-s)
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1. 1.6 x 1015
2. 3.3 x 1016
3. 4.8 x 1017
4. 2.6 x 1018
What speed does a 0.06 kg golf ball have if its de Broglie wavelength is 4.28 x 10-34 m?
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1. 15 m/s
2. 26 m/s
3. 31 m/s
4. 48 m/s
The electron microscope's main advantage over the optical microscope is which of the following?
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1. greater ease of portability
2. dispenses with need for a lens
3. higher power lens used
4. higher resolution possible
The wave function as derived in Schrodinger's equation is best described as being a measure of which of the following?
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1. photon beam frequency
2. photon wavelength
3. particle wavelength
4. probability
What is the de Broglie wavelength for a proton (m = 1.67 x 10-27 kg) moving at a speed of 5.0 x 105 m/s? (h = 6.63 x 10-34 J-s)
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1. 1.1 x 10-12 m
2. 0.42 x 10-12 m
3. 1.8 x 10-12 m
4. 0.79 x 10-12 m
What is the minimum X-ray wavelength produced when electrons are accelerated through a potential of 50,000 V? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s and 1 eV = 1.6 x 10-19 J)
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1. 12.4 x 10-12 m
2. 16.5 x 10-12 m
3. 19.8 x 10-12 m
4. 24.9 x 10-12 m
A monochromatic light beam is incident on a barium target which has a work function of 2.50 eV. If a stopping potential of 1.0 V is required, what is the light beam wavelength? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m)
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1. 355 nm
2. 497 nm
3. 744 nm
4. 1421 nm
Light of wavelength 450 nm is incident on a target metal which has a work function of 1.8 eV. What stopping potential is required for this combination in a phototube? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m)
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1. 0.57 V
2. 0.96 V
3. 2.76 V
4. 4.56 V
If barium has a work function of 2.60 eV, what is its cutoff wavelength when used as a phototube target? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m)
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1. 398 nm
2. 477 nm
3. 497 nm
4. 596 nm
A monochromatic light beam is incident on a barium target, which has a work function of 2.50 eV. If a stopping potential of 1.0 V is required, what is the light beam photon energy?
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1. 1.0 eV
2. 1.5 eV
3. 2.5 eV
4. 3.5 eV
According to Heisenberg, as the uncertainty in the measurement of a particle's position is reduced by a factor of 3, by what factor is the uncertainty in that same particle's momentum changed?
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1. 1/3
2. 1.0
3. 3.0
4. 9.0
What is the frequency of monochromatic light where the photon energy is 4.0 x 10-
19 J? (h = 6.63 x 10-34 J-s)
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1. 3.2 x 1014 Hz
2. 4.4 x 1014 Hz
3. 6.0 x 1014 Hz
4. 6.8 x 1014 Hz
What is the wavelength of a monochromatic light beam, where the photon energy is 5.0 x 10-
19 J? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s and 1 nm = 10-9 m)
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1. 354 nm
2. 398 nm
3. 414 nm
4. 787 nm
What is the wavelength of a monochromatic light beam where the photon energy is 2.0 eV? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 nm = 10-9 m and 1 eV = 1.6 x 10-19 J)
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1. 414 nm
2. 621 nm
3. 746 nm
4. 829 nm
According to de Broglie, as the momentum of a moving particle is tripled, the corresponding wavelength changes by what factor?
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1. 1/9
2. 1/3
3. 3.0
4. 9.0
If the measured momentum of an electron is 3.20 x 10-27 kg-m/s with an uncertainty of 1.6 x 10-29 kg-m/s, what is the minimum uncertainty in the determination of its position? (h = 6.63 x 10-34 J-s)
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1. 2.6 x 10-8 m
2. 3.3 x 10-6 m
3. 0.63 x 10-4 m
4. 1.1 x 10-3 m
As the temperature of a radiation emitting blackbody becomes higher, what happens to the peak wavelength of the radiation?
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1. increases
2. decreases
3. remains constant
4. is directly proportional to temperature
According to Einstein, what is true of the stopping potential for a photoelectric current as the wavelength of incident light becomes shorter?
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1. increases
2. decreases
3. remains constant
4. stopping potential is directly proportional to wavelength
According to Einstein, what is true of the work function of a target material in a phototube as the wavelength of the incident monochromatic light beam becomes shorter?
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1. increases
2. decreases
3. remains constant
4. work function is directly proportional to wavelength
According to the de Broglie hypothesis, which of the following statements is applicable to the wavelength of a moving particle?
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1. directly proportional to its energy
2. directly proportional to its momentum
3. inversely proportional to its energy
4. inversely proportional to its momentum
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