A spring block system with mass of block m and spring constant K (all the surfaces of blocks are perfectly abosrbing and smooth) is placed on a smooth horizontal plane as shown in the diagram at rest. A light beam of intensity l is switched on its right side. find the amplitude of oscillations of the block. (face area of block is A and c is the speed of light in vacuum)

Options

A. `(l)/(Kc)A`
B. `(2l)/(Kc)A`
C. `(4l)/(Kc)A`
D. zero

Answer

A

Explanation

Leftward force `=(lA)/(c)=(DeltaP)/(Deltat)`