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Physics
10th -
12thgrade
Photoelectric Effect & wave particle duality
32 questions
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- 1. Multiple Choice
A particle of light is called a...
Photoelectron
Photon
Proton
Electron
- 2. Multiple Choice
The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light
Intensity
Wavelength
Frequency
Energy
- 3. Multiple Choice
What color of light has the greatest energy per photon?
Red
Green
Blue
Violet
- 4. Multiple Choice
A discrete quanta of energy of EM radiation is called a:
Photon
Wave
Planck constant
Particle
- 5. Multiple Choice
The energy of photoelectrons emitted from a metal surface can be increased by
using light of higher frequency.
using light of longer wavelength.
using light of higher intensity.
using monochromatic, polarized light.
- 6. Multiple ChoiceThe photoelectric effect only occurs if the light shining on the metal is:coherent.above a minimum intensity.above a minimum frequency.above a minimum wavelength.
- 7. Multiple ChoiceThis image is an illustration ofphotoelectric effectDalton's atomic theoryBohr modelQuantum mechanical model
- 8. Multiple Choice
Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?
only high frequency
only low frequency
both of them
doesn't depend to frequency
- 9. Multiple Choice
What is the best description of 'threshold frequency'?
The minimum energy needed for electrons to escape a surface.
The maximum kinetic energy that an emitted electron has.
The minimum frequency of a photon that will cause an electron to be emitted.
The frequency that an emitted electron will have.
- 10. Multiple Choice
One photon interacts with only one electron. True or false?
True
False
- 11. Multiple Choice
Does this support the wave or particle model of light: The fact that there is no time delay between illumination and emission of a photo-electron.
Wave
Particle
- 12. Multiple Choice
Does this support the wave or particle model of light: The diffraction of light through a gap
Wave
Particle
- 13. Multiple Choice
Does this support the wave or particle model of light: the rate of emission of photoelectrons only depends on the intensity, not the frequency
Wave
Particle
- 14. Multiple Choice
Does this support the wave or particle model of light: the max KE of a photelectron depends on the frequency of the light, not the intensity.
Wave
Particle
- 15. Multiple Choice
Does this support the wave or particle model of light: the interference of light.
Wave
Particle
- 16. Multiple Choice
The electronvolt is a unit of
energy
charge
electric field strength
electric field potential
- 17. Multiple Choice
A photon of light traveling through space with a wavelength of 6 x 10-7 meters has an energy of
4.0 x 10-40 J
3.3 x 10-19 J
5.4 x 1010 J
5.0 x 1014 J
- 18. Multiple ChoiceWhat must the minimum energy of photons falling ona copper plate be in order to observe the photoelectriceffect? (work function for copper 4.7 eV)2.35 eV1.175 eV4.7 eV9.4 eV
- 19. Multiple ChoiceThe photoelectric effect is observed on barium oxide(BaO) at a minimum frequency of 0.24x1015 Hz . Find the work function of bariumoxide in eV.1 eV2 eV1.6 eV2.7 eV
- 20. Multiple Choice
Which of these is an example of the photoelectric effect?
Electrons are directed on a metal surface and quanta of visible light are emitted.
Infra-red radiation is directed on a metal surface and quanta of visible light are emitted.
Microwaves are directed on a metal surface and electrons are emitted.
Ultra violet radiation is directed on a metal surface and electrons are emitted
- 21. Multiple Choice
The equation hf = φ + 1/2mvmax2 is used when studying the photoelectric effect. What is the meaning of each term in this equation?
hf = energy of photoelectron
φ = least energy required to release an electron
1/2mvmax2 = maximum kinetic energy of a photon
hf = energy of photoelectron
φ = work done by an incoming photon
1/2mvmax2 = maximum kinetic energy of a photoelectron
hf = energy of photon
φ = least energy required to release an electron
1/2mvmax2 = maximum kinetic energy of a photoelectron
hf = energy of photon
φ = work done by incoming photon
1/2mvmax2 = maximum kinetic energy of a photon
- 22. Multiple ChoiceThe graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
Plank's constant is determined by:the x-intercept.the y-intercept.the gradient.the area under the graph. - 23. Multiple ChoiceThe graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The work function is determined by:the x-intercept.the y-intercept.the gradient.the area under the graph. - 24. Multiple ChoiceThe graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The threshold frequency is determined by:the x-intercept.the y-intercept.the gradient.the area under the graph. - 25. Multiple ChoiceLight emitted from a laser has wavelength 350 nm. Each pulse of light from the laser lasts for only 1.2 × 10–13 s. The power delivered in a pulse is 8.0 × 104 W. Calculate the number of photons in a single pulse.1.7 x 10102.2 x 10112.9 x 1066.7 x 1017
- 26. Multiple Choice
A particle of mass m has a kinetic energy of E.
What is the de Broglie wavelength of this particle?
A
B
C
D
- 27. Multiple Choice
Which row links both the photoelectric effect and electron diffraction to the properties of waves and particles?
A
B
C
D
- 28. Multiple Choice
Electrons moving in a beam have the same de Broglie wavelength as protons in a separate beam moving at a speed of 2.8 × 104 m s–1.
What is the speed of the electrons?
1.5 × 101 m s–1
2.8 × 104 m s–1
1.2 × 106 m s–1
5.1 × 107 m s–1
- 29. Multiple Choice
Which graph best shows the relationship between the momentum p and the wavelength λ for photons?
A
B
C
D
- 30. Multiple Choice
Electrons and protons in two beams are travelling at the same speed. The beams are diffracted by objects of the same size.
Which correctly compares the de Broglie wavelength λe of the electrons with the de Broglie wavelength λp of the protons and the width of the diffraction patterns that are produced by these beams?
A
B
C
D
- 31. Multiple Choice
An electron has a kinetic energy E and a de Broglie wavelength λ. The kinetic energy is increased to 4E. What is the new de Broglie wavelength?
λ/4
λ/2
λ
4λ
- 32. Multiple Choice
A proton moving with a speed ν has a de Broglie wavelength λ.
What is the de Broglie wavelength of an alpha particle moving at the same speed ν?
λ/4
λ
2λ
4λ
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