When a point light source, of power `W`, emiting monochromatic light of wavelength `lambda` is kept at a distance `a` from a small photosensitive surface of work function `phi` and area `S`. Then

When a point light source of power W emitting monochromatic light of wavelength lamda is kept at a distance alpha from a photo-sensitive surface of work function phi and area S, we will have

A point source of constant power P is emitting photon of wavelength lambda . What is the intensity of photons at r distance from the source ?(speed of light = c)

A light source emit monochromatic light of 5000 Å wavelength and produce 5 W power .When it is displaced by 0.5 m from photo sensitive surface photoelectron are emitted,when distance increased by 0.5, no.of photoelectron liberated will become ……

The number of photons emitted per second by a 60W source of monochromatic light of wavelength 663nm is

The number of photons emitted per second by a 62W source of monochromatic light of wavelength 4800 A^(@) is

A 5 W point source emits monochromatic light of wave length 500Å What should be the work function of the meal from whose surface this light can liberate photoelectrons?

A 5 W source emits monochromatic light of wavelength 5000 Å . When placed 0.5 m away , it liberates photoelectrons from a photosensitive metallic surface . When the source is moved to a distance of 1.0 m the number of photoelectrons liberated will be reduced by a factor of

A 5 W source emits monochromatic light of wavelength 5000 Å . When placed 0.5 m away , it liberates photoelectrons from a photosensitive metallic surface . When the source is moved to a distance of 1.0 m the number of photoelectrons liberated will be reduced by a factor of

A 5 W source emits monochromatic light of wavelength 5000 Å . When placed 0.5 m away , it liberates photoelectrons from a photosensitive metallic surface . When the source is moved to a distance of 1.0 m the number of photoelectrons liberated will be reduced by a factor of