A photosensitive surface is illuminated with a beam of (i) yellow light, and (ii) red light, both of the same intensity.
In which case will
(I) photoelectrons have more `E_(k)`?
(II) more numbers of electrons be emitted ?
Justify your answer in each case.

Two beams one of red light and other of blue light of the same intensity are incident on a metallic surface to emit photoelectrons. Which one of the two beam emits electrons of greater kinetic energy?

Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.

Assertion: A photosensitive surface is illuminated by a monochromatic light of wavelength lambda and intensity I. The number of photoelectrons emitted per second is doubled when the intensity of light is doubled. However, the maximum speed of emitted electrons remains unchanged. Reason: The number of electrons emitted per second is directly proportional to the intensity of the incident light. The kinetic energy of the emitted photoelectrons is independent of the intensity of the light.

Mention against each of the whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. Mirror

Among the elements B, AI,C and Si , (i) Which elements has the highest first ionisation enthaloy? (ii) When element has the most metallic character? Justify your answer in each case.

fig. shows variation of stopping potential (V_0) with frequency (v) for two photosenstive matrials M_1 and M_2 . (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.

Mention against each of the whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. Cardboard surface

Mention against each of the whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. Piece of paper

Mention against each of the whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. Chalk powder