There are two sources of light each emitting with a power of 100 w. one emits X- rays of wave length 1 nm and the other visible light at 500 nm. Find the radio of no of photons of x- rays to the photons of visible light of the given wave length ?

Question

$\begin{array}{1 1} 500 :1 \\ 1: 500 \\ 2: 500 \\ 500 :2 \end{array} $