When a point light source, of power `W`, emitting 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 , 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

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)

The two coherent sources of monochromatic light of wavelength lambda are located at a separation lambda . The two sources are placed on a horizontal line and screen is placed perpendicular to the line joining the sources. Find position of the farthest minima from the centre of the sources.

A 100 W point source emits monochromatic light of wavelength 6000 A Calculate the total number of photons emitted by the source per second.

A 20 W light source emits monochromatic light of wavelength 600 nm the number of photons ejected per second in the form of avogardro 's number will be

When a metallic surface is illuminated with monochromatic light of wavelength lambda , the stopping potential is 5 V_0 . When the same surface is illuminated with light of wavelength 3lambda , the stopping potential is V_0 . If work function of the metallic surface is

When a metallic surface is illuminated with monochromatic light of wavelength lambda , the stopping potential is 5 V_0 . When the same surface is illuminated with light of wavelength 3lambda , the stopping potential is V_0 . Then the work function of the metallic surface is:

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

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