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- 1. Multiple Choice
The graph shows how the maximum kinetic energy Ek of photoelectrons emitted from a metal surface varies with the reciprocal of the wavelength λ of the incident radiation.
What is the gradient of this graph?
c
h
hc
h/c
- 2. Multiple Choice
Photons of wavelength 290 nm are incident on a metal plate. The work function of the metal is 4.1 eV
What is the maximum kinetic energy of the emitted electrons?
0.19 eV
4.3 eV
6.9 eV
8.4 eV
- 3. Multiple Choice
Which statement suggests that electrons have wave properties?
Electrons are emitted in photoelectric effect experiments.
Electrons are released when atoms are ionised.
Electrons produce dark rings in diffraction experiments.
Electron transitions in atoms produce line spectra.
- 4. Multiple Choice
When light of a certain frequency greater than the threshold frequency of a metal is directed at the metal, photoelectrons are emitted from the surface. The power of the light incident on the metal surface is doubled.
Which row shows the effect on the maximum kinetic energy and the number of photoelectrons emitted per second?
Maximum kinetic energy: remains unchanged
Number of photoelectrons emitted per second: remains unchanged
Maximum kinetic energy: doubles
Number of photoelectrons emitted per second: remains unchanged
Maximum kinetic energy: remains unchanged
Number of photoelectrons emitted per second: doubles
Maximum kinetic energy: doubles
Number of photoelectrons emitted per second: doubles
- 5. Multiple Choice
Line X on the graphs below shows how the maximum kinetic energy of emitted photoelectrons varies with the frequency of incident radiation for a particular metal.
Which graph shows the results for a metal Y that has a higher work function than X?
- 6. Multiple Choice
A beam of light of wavelength λ is incident on a clean metal surface and photoelectrons are emitted. The wavelength of the light is halved but energy incident per second is kept the same.
Which row in the table is correct?
Maximum kinetic energy of the emitted photoelectrons: Increases
Number of photoelectrons emitted per second: Unchanged
Maximum kinetic energy of the emitted photoelectrons: Decreases
Number of photoelectrons emitted per second: Increases
Maximum kinetic energy of the emitted photoelectrons: Increases
Number of photoelectrons emitted per second: Decreases
Maximum kinetic energy of the emitted photoelectrons: Decreases
Number of photoelectrons emitted per second: Unchanged
- 7. Multiple Choice
In an experiment to demonstrate the photoelectric effect, a charged metal plate is illuminated with light from different sources. The plate loses its charge when an ultraviolet light source is used but not when a red light source is used.
What is the reason for this?
The intensity of the red light is too low.
The wavelength of the red light is too short.
The frequency of the red light is too high.
The energy of red light photons is too small.
- 8. Multiple Choice
Electromagnetic radiation incident on a metal surface can cause electrons to be emitted.
Which of the following statements is correct?
Every photon incident on the surface causes an electron to be emitted.
All the emitted electrons have the same energy.
The range of energy of the emitted electrons depends on the intensity of the radiation.
If the incident radiation is of a single frequency, the number of electrons emitted per second increases if the intensity of the radiation increases.
- 9. Multiple Choice
When comparing X-rays with UV radiation, which statement is correct?
X-rays have a lower frequency.
X-rays travel faster in a vacuum.
X-rays do not show diffraction and interference effects.
Using the same element, photoelectrons emitted using X-rays have the greater maximum kinetic energy.
- 10. Multiple Choice
Monochromatic radiation from a source of light (source A) is shone on to a metallic surface and electrons are emitted from the surface. When a second source (source B) is used no electrons are emitted from the metallic surface. Which property of the radiation from source A must be greater than that from source B?
amplitude
frequency
intensity
wavelength
- 11. Multiple Choice
In a photoelectric experiment, light is incident on the metal surface of a photocell. Increasing the intensity of the illumination at the surface leads to an increase in the
work function
minimum frequency at which electrons are emitted
current through the photocell
speed of the electrons
- 12. Multiple Choice
A particle of light is called a...
Photoelectron
Photon
Proton
Electron
- 13. Multiple Choice
The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light
Intensity
Wavelength
Frequency
Energy
- 14. Multiple Choice
What color of light has the greatest energy per photon?
Red
Green
Blue
Violet
- 15. 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.
- 16. 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.
- 17. 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.
- 18. Multiple ChoiceThe energy of the emitted electron is ------------hfh/fhf + Φhf - Φ
- 19. Multiple Choicethe energy of the photon is ---------------hfh/fhf + Φhf - Φ
- 20. Multiple ChoiceIn the photo electric effect ---------------- fell onto a polished metal surface.electronsphotonswavesplutons
- 21. Multiple ChoiceThis caused ------------------ to be emitted by the surfaceelectronsphotonswavesplutons
- 22. Multiple ChoiceThe energy of the emitted electrons was measured using a -----------------standing voltagestriking voltagestopping voltagestarting voltage
- 23. Multiple ChoiceThe energy of the emitted photon can also be worked out from the stopping voltage -----------VeVeV - ΦeV + Φ
- 24. Multiple ChoiceThe equation for the photoelectric effect is
eV = hf - Φ
The graph of electron energy against frequency isa straight line through the origina straight line gradient ha straight line with a positive y interceptnot a straight line - 25. Multiple Choicethe wavelength of a photon can be found usingλ = cfλ = hfλ = c/fλ = f/c
- 26. Multiple ChoiceA student has 3 lasers red, green and blue.
When the green laser is shone onto a metal surface electrons are releasedthe blue laser will release more electronsthe red laser won't release electronsthe cut-off wavelength is shorter than the wavelength of green light.the blue laser will release more energetic electrons - 27. Multiple ChoiceThe diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.
Which of the following changes could cause the photocurrent to stop?Increasing the potential difference of the power supply.Increasing the frequency of the UV light.Increasing the intensity of the UV light.Changing the metal surface to one with a smaller work function. - 28. Multiple ChoiceLight of a single wavelength is incident on a metal. Electrons are released. The intensity of the light is then increased.
Which of the following changes occur?Rate of electron emission: increase.
Energy of electrons: increase.Rate of electron emission: decrease.
Energy of electrons: no change.Rate of electron emission: decrease.
Energy of electrons: increase.Rate of electron emission: increase.
Energy of electrons: no change. - 29. 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.
- 30. 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. - 31. 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. - 32. 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. - 33. Multiple ChoiceWhich statement about the photoelectric effect is correct?Electrons are emitted instantaneously.Electrons are not emitted below a certain wavelength.You can change the energy of the electrons by changing the intensity.Electron energy is independent of frequency.
- 34. Multiple ChoiceThe following observations are made about the photoelectric effect:
1. No electrons are emitted below the threshold frequency.
2. Above the threshold frequency the energy of electrons depends on the frequency of the light.
3. Increasing intensity increases the number of emitted electrons.
Which (if any) of these observations can be explained by a wave theory of light?All of them.1 and 2 only.3 only.None of them. - 35. Multiple ChoiceThe photoelectric effect is when:Electrons collide inside a metal to release photons.One incident metal electron releases one photon.One incident photon releases one electron from a metal.Photons are absorbed in to metal ions releasing electrons.
- 36. 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
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