Question

The momentum of a photon is 3.3 $\times {10}^{-29}$ kg - m/sec. Its frequency will be

• A. $3\times {10}^{3}Hz$
• B. $6\times {10}^{3}Hz$
• C. $7.5\times {10}^{12}Hz$
• D. $1.5\times {10}^{13}Hz$

Answer 1

The correct option is D $1.5\times {10}^{13}Hz$

$p=\frac{hv}{c}\Rightarrow v=\frac{pc}{h}=\frac{3.3\times {10}^{-29}\times 3\times {10}^8}{6.6\times {10}^{-34}}=1.5\times {10}^{13}Hz.$