Question

What is the momentum of a photon having frequency $ 1.5 \times 10^{13}\, Hz $ ?

• A. $ 3.3 \times 10^{-29}\, kg-m/s $
• B. $ 3.3 \times 10^{-34}\, kg-m/s $
• C. $ 6.6 \times 10^{-34}\, kg-m/s $
• D. $ 6.6 \times 10^{-32}\, kg-m/s $

Answer 1

Answer: (A)

$ n = 1.5 \times 10^{13} \,Hz$
$p = \frac{h}{\lambda}$
$ = \frac{6.6\times 10^{-34}}{c/n}$
$ = \frac{6.6 \times 10^{-34} \times 1.5 \times 10^{13}}{3\times 10^8}$
$ = 3.3 \times 10^{29} \,kg-m/s$