Photoelectric Effect(General Knowledge > General Science ) Questions and Answers

Question 1. Photoelectric effect provides the evidence for the ______ nature of radiation
  1.    dual
  2.    wave
  3.    particle
  4.    electromagnetic
Explanation:-
Answer: Option C. -> particle
Question 2. Light of a given wavelength is used to illuminate the surface of a metal
  1.    lower energy
  2.    higher intensity
  3.    shorter frequency
  4.    higher frequency
Explanation:-
Answer: Option D. -> higher frequency
Question 3. What is the energy of a photon with a frequency of 5x1014 Hz? (you need to do calculation
  1.    2.5x10-19 J
  2.    3.0x10-19 J
  3.    3.3x10-19 J
  4.    4.5x10-19 J
Explanation:-
Answer: Option C. -> 3.3x10-19 J
Question 4. Which of the following metals will exhibit a photoelectric effect most easily?
  1.    Caesium
  2.    Magnesium
  3.    Lithium
  4.    Sodium
Explanation:-
Answer: Option A. -> Caesium
Question 5. On which part of the photoelectric cell does the radiation strikes?
  1.    Anode
  2.    Ammeter
  3.    Cathode
  4.    Radiation does not strike on the photoelectric cell
Explanation:-
Answer: Option C. -> Cathode
Question 6. Photo-electric effect was first discovered by
  1.    Hertz
  2.    Halwachs
  3.    Einstein
  4.    Leonard
Explanation:-
Answer: Option A. -> Hertz
Question 7. The following observations are made about the photoelectric effect:1
  1.    All of them.
  2.    1, 2 and 4 only.
  3.    3 only.
  4.    None of them.
Explanation:-
Answer: Option B. -> 1, 2 and 4 only.
Question 8. What is the maximum kinetic energy of electrons emitted from caesium (Cs), when light of frequency 1x 1015 Hz falls upon the metal? (work function for Cs is 2
  1.    8.0x10-19 J
  2.    4.0 eV
  3.    2.0 x10-19 J
  4.    2.0 eV
Explanation:-
Answer: Option D. -> 2.0 eV
Question 9. What did Max Planck tell about light?
  1.    Light travels in the form of small packets of energy called photons.
  2.    Light travels in the form of small packets of energy called quanta.
  3.    Light travels in the form of electromagnetic radiation.
  4.    Light is made up of tiny particles called corpuscles.
Explanation:-
Answer: Option B. -> Light travels in the form of small packets of energy called quanta.
Question 10. Why wave nature of matter is not apparent to our daily observations?
  1.    bodies travel with small velocities
  2.    wavelength of the waves associated with the pretty heavy mass is very large
  3.    bodies travel with large velocities
  4.    wavelength of the waves associated with the pretty heavy mass is very small
Explanation:-
Answer: Option D. -> wavelength of the waves associated with the pretty heavy mass is very small
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