Question

The momentum of the photon of wavelength $5000\dot{A}$ will be

• A. $1.3\times {10}^{-27}kg-m/sec$
• B. $1.3\times {10}^{-28}kg-m/sec$
• C. $4\times {10}^{29}kg-m/sec$
• D. $4\times {10}^{-18}kg-m/sec$

Answer 1

The correct option is A

$1.3\times {10}^{-27}kg-m/sec$

$p=\frac{h}{\lambda }=\frac{6.6\times {10}^{-34}}{(5000\times {10}^{-10})}=1.3\times {10}^{-27}kg-m/s$