Photoelectric effect and Einstein’s equation - One Line Questions

1. The work function (Φ) of a metal is typically in the range of: — 1 to 10 eV
2. The work function of a metal is 2.2 eV. If light of wavelength 500 nm is incident on it, what is the maximum kinetic energy of the emitted photoelectrons? — 0.28 eV
3. The work function of a metal is 4.0 eV. If photons of energy 5.0 eV strike the metal, what is the maximum kinetic energy of the emitted photoelectrons? — 1.0 eV
4. If the stopping potential is 2 V for a certain frequency of incident light, what is the maximum kinetic energy of the emitted photoelectrons? — 2 eV
5. What is the maximum kinetic energy of photoelectrons emitted from a metal surface when light of frequency 1.0 x 10^15 Hz is incident on it, given that the work function is 2.0 eV? — 0.28 eV
6. The threshold wavelength for a metal is 400 nm. What is its work function? — 3.1 eV
7. If the threshold frequency for a metal is 8.0 x 10^14 Hz, what is the work function? — 5.3 eV
8. What is the energy of a photon of green light with a frequency of 5.5 x 10^14 Hz? — 3.64 eV
9. If the work function of a metal is 2.5 eV, what is the minimum wavelength of light that can cause photoemission? — 496 nm
10. If a metal has a work function of 2.3 eV, what is the minimum frequency of light required to cause photoemission? — 5.57 x 10^14 Hz
11. What is the value of Planck's constant (h)? — 6.626 x 10^-34 J s
12. What is the threshold frequency for a metal with a work function of 3.0 eV? — 7.25 x 10^14 Hz
13. The photoelectric effect demonstrates that light can behave as: — Both a wave and a particle
14. The photoelectric effect is an example of the interaction of electromagnetic radiation with: — Electrons
15. If the frequency of incident radiation is decreased below the threshold frequency, the photoelectric current: — Becomes zero
16. Which phenomenon demonstrates the particle nature of light? — Photoelectric effect
17. If the frequency of incident radiation is doubled, the maximum kinetic energy of emitted photoelectrons will: — Increase, but not necessarily double
18. What is the relationship between stopping potential (V_s) and the maximum kinetic energy (E_k) of emitted electrons? — E_k = e V_s
19. The momentum of a photon of energy E is given by: — E/c
20. If the frequency of incident light is less than the threshold frequency, what happens to the photoelectric emission? — No electrons are emitted.
21. The intensity of light is related to the square of its: — Amplitude
22. The stopping potential required to stop the emission of electrons from a metal is independent of: — Intensity of incident light
23. If the work function of a metal is Φ, and incident photons have energy E, then for photoemission to occur, E must be: — Greater than Φ
24. If a metal surface emits photoelectrons when illuminated by blue light of wavelength 450 nm, it will also emit photoelectrons when illuminated by: — Ultraviolet light of wavelength 200 nm
25. The maximum kinetic energy of emitted photoelectrons is plotted against the frequency of incident light. The slope of the graph is equal to: — h
26. The slope of the graph of stopping potential (V_s) versus frequency (f) of incident light is: — h/e
27. If the threshold wavelength of a metal is λ_0, then the maximum kinetic energy of emitted electrons when light of wavelength λ (< λ_0) is incident is given by: — hc(λ_0 - λ) / (λ * λ_0)
28. The stopping potential (V_s) in the photoelectric effect is the potential required to: — Reduce the kinetic energy of emitted electrons to zero.
29. In the photoelectric effect, if the intensity of incident light is increased (keeping frequency constant), what happens to the kinetic energy of emitted electrons? — Remains the same
30. In the photoelectric effect, if the intensity of incident light is increased (keeping frequency constant), what happens to the photoelectric current? — Increases
31. If the frequency of incident radiation is doubled, the stopping potential: — Increases, but not necessarily doubled
32. The photoelectric effect is a quantum phenomenon because: — It involves the exchange of energy in discrete packets (photons).
33. The unit of work function (Φ) is typically: — Electronvolt (eV)
34. Einstein's photoelectric equation is given by E_k = hf - Φ. What does Φ represent? — Work function of the metal
35. Who explained the photoelectric effect using the quantum theory of light? — Albert Einstein
36. According to Einstein's equation, if the frequency of incident light is equal to the threshold frequency, the maximum kinetic energy of emitted electrons is: — Zero
37. What is the minimum frequency of incident radiation required to eject electrons from a metal surface called? — Threshold frequency
38. The photoelectric effect is observed in: — Metals only
39. Which quantity is conserved in the photoelectric effect? — Energy
40. Which of the following statements about the photoelectric effect is INCORRECT? — The energy of emitted electrons depends on the intensity of incident light.
41. The work function of a metal depends on: — The nature of the metal surface
42. Which of the following statements is true regarding the photoelectric effect? — The threshold frequency is a characteristic property of the metal.
43. The phenomenon of photoelectric emission is instantaneous, meaning: — There is no time lag between incidence of light and emission of electrons.
44. What is the value of the intercept on the frequency axis when E_k is plotted against f in the photoelectric effect? — Threshold frequency
45. If the frequency of incident light is increased by a factor of 3, and the new frequency is still greater than the threshold frequency, the maximum kinetic energy of emitted electrons will: — Increase, but cannot be determined without knowing the original frequency
46. The photoelectric effect provides evidence for the: — Particle nature of light
47. The photoelectric effect cannot be explained by classical wave theory because: — All of the above
48. The energy of a photon is directly proportional to its: — Frequency
49. In Einstein's photoelectric equation, E_k = hf - Φ, the term 'hf' represents the: — Energy of the incident photon
50. Which experiment provided the first direct evidence for the existence of photons? — Photoelectric effect
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