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PHOTOELECTRIC EFFECT MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. What color of light has the greatest energy per photon?
  1.    Red
  2.    Green
  3.    Blue
  4.    Violet
 Discuss Question
Answer: Option D. -> Violet
Question 12. What is the energy of a photon with a frequency of 5x1014 Hz?
  1.    2.5x10-19 J
  2.    3.0x10-19 J
  3.    3.3x10-19 J
  4.    4.5x10-19 J
 Discuss Question
Answer: Option C. -> 3.3x10-19 J
Question 13. Which statement about the photoelectric effect is correct?
  1.    Electrons are emitted instantaneously.
  2.    Electrons are not emitted below a certain wavelength.
  3.    You can change the energy of the electrons by changing the intensity.
  4.    Electron energy is independent of frequency.
 Discuss Question
Answer: Option A. -> Electrons are emitted instantaneously.
Question 14. To release an electron the energy of the photon had to be more than
  1.    zero
  2.    the cut off frequency
  3.    the work function
  4.    the cut off wavelength
 Discuss Question
Answer: Option C. -> the work function
Question 15. When light of specific frequencies is shined on a surface, electrons are ejected from the surface
  1.    Quantization of Energy
  2.    Photoelectric Effect
  3.    Compton Effect
  4.    deBroglie Waves
 Discuss Question
Answer: Option B. -> Photoelectric Effect
Question 16. The work function of a metal surface is 6
  1.    100 nm
  2.    200 nm
  3.    300 nm
  4.    400 nm
 Discuss Question
Answer: Option B. -> 200 nm
Question 17. What is the energy, in eV, of a photon that has a wavelength of 620 nm?
  1.    1eV
  2.    2eV
  3.    3eV
  4.    4eV
 Discuss Question
Answer: Option B. -> 2eV
Question 18. Which of the following gases are filled inside the Photoelectric cells?
  1.    Neon
  2.    Nitrogen
  3.    Carbon Dioxide
  4.    Oxygen
 Discuss Question
Answer: Option A. -> Neon
Question 19. The energy of a photon is directly proportional to its _____ and inversely proportional to its ______
  1.    intensity - speed
  2.    wavelength - frequency
  3.    frequency - wavelength
  4.    intensity - wavelength
 Discuss Question
Answer: Option C. -> frequency - wavelength
Question 20. What does the slope of the graph represent?
  1.    Speed of light
  2.    Mass of a photon
  3.    Planck's constant
  4.    Stopping potential
 Discuss Question
Answer: Option C. -> Planck's constant

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