Question

Momentum of a photon having frequency $1.5\times {10}^{13}Hz$?

• A. $3.13\times {10}^{-29}kgm/s$
• B. $3.3\times {10}^{-34}kgm/s$
• C. $6.6\times {10}^{-34}kgm/s$
• D. $6.6\times {10}^{-30}kgm/s$

Answer 1

Answer: (A)

$3.13\times {10}^{-29}kgm/s$

$MomentumofaphotonisP=h/\lambda And\lambda \nu =c,wherec=speedoflighth=Planc{k}^{\prime }sconstant\lambda =wavelengthofphoton\nu =frequencyofphotonso\lambda =\frac{3\times {10}^8}{1.5\times {10}^{13}}=2\times {10}^{-5}{m}^{}P=\frac{6.26\times {10}^{-34}}{2\times {10}^{-5}}=3.13\times {10}^{-29}kgm/sThereforeoptionA.$