`'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 ^(n)P_(4)=360, find the value of n

Find the value of   P( n , n -1 )

If n(A)=2, then find the value of n(P(A))

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) .

If ^(n)P_(5)=20^(n)P_(3), find the value of n