Question

If wavelength of photon is $2.2 \times 10^{-11} \,m$ and $h =6.6 \times 10^{-34} Js$, then momentum of photon

• A. $1.452 \times 10^{-44} kg \,ms ^{-1}$
• B. $6.89 \times 10^{43} kg \,m s ^{-1}$
• C. $3 \times 10^{-23} kg \,m s ^{-1}$
• D. $3.33 \times 10^{-22} kg\, m s ^{-1}$

Answer 1

Answer: (C)

$\lambda=\frac{ h }{ mv }=\frac{ h }{ p }$
$p =\frac{ h }{\lambda}=\frac{6.6 \times 10^{-34}}{2.2 \times 10^{-11}}=3 \times 10^{-23}$