question_answer1) Define photoelectric work function. How is it related to threshold frequency?
question_answer2) How will you justify that the rest mass of photons is zero?
question_answer3) Do all the photons have same mass? If not, why?
question_answer4) Which photon is more energetic: A red one or a violet one?
question_answer6) What happens to the wavelength of a photon after it collides with an electron?
question_answer7) Why are alkali metals most suited as photo-sensitive metals?
question_answer8) Does each incident photon essentially eject an electron?
question_answer12) Can X-rays cause photoelectric effect?
question_answer27) State de-Broglie hypothesis.
question_answer29) Are matter waves electromagnetic? Write de-Broglie equation.
question_answer30) Why are de-Broglie waves associated with a moving football not visible?
question_answer34) Why is a photo-cell also called an electric eye?
question_answer35) On what principle is an electron microscope based?
question_answer69) An electron and a proton have same wavelength. Which one possesses more energy?
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(i) Explain which metal has smaller threshold wavelength. (ii) Explain, giving reason, which metals emits photo electrons having smaller kinetic energy, for the same wavelength of incident radiation. (iii) If the distance between the light source and metal P is doubled, how will the stopping potential charge? 
(i) Why is the slope same for both lines? (ii) For which material will the emitted electrons have greater kinetic energy for the incident radiations of the same frequency? Justify your answer. 
(b) 
(i) Which physical parameter is kept constant for the three curves? (ii) Which frequency \[\text{(}{{\text{v}}_{\text{1}}}\text{,}{{\text{v}}_{\text{2}}}\text{or }{{\text{v}}_{3}}\text{)}\] is the highest? 
Point out the two curves for which the incident radiations have same frequency but different intensities. 
