`'S'` is isotropic point source producing monochromatic radiation with power `P`. Force on hemisphere is `P/(nC)`. Find the value of '`n'` (C is speed of ligth).

If ^nC_4, ^nC_5, ^nC_6 are in A.P. then the value of n is

An isotropic point source emits light with wavelength 589 nm. The radiation power of the source is P = 10 W. (a) Find the number of photons passing through unit area per second at a distance of 2 m from the source. (b) Also calculate the distance between the source and the point where the mean concentration of the photons is 100//cm^(3) .

An isotropic point source emits light with wavelength 589 nm. The radiation power of the source is P = 10 W. (a) Find the number of photons passing through unit area per second at a distance of 2 m from the source. (b) Also calculate the distance between the source and the point where the mean concentration of the photons is 100//cm^(3) .

In p -n junction photocell electromotive force due to monochromatic light is proportional to

A point source of radiation power P is placed on the axis of an ideal plane mirror. The distance between the source and the mirror is n times the radius of the mirror. The force that light exerts on the mirror is (P)/(xc(n^(2)+y))