A homogeneous ball (mass=m) of ideal black material at rest is illuminated with a radiation having a set of photons (wavelength - $\lambda$),each with the same momentum and the same energy. The rate at which photons fall on the ball is n. The linear acceleration of the ball is

• A

  $m\lambda /nh$

• B

  $nh/m\lambda$

• C

  $nh/\left(2\pi \right)\left(m\lambda \right)$

• D

  $2pm\lambda /nh$