The momentum of a photon in an $X-$ray beam of $10^{-10} \ m$ wavelength is
- A$1.5 \times 10^{-23} \ kg \ m/s$
- B$6.6 \times 10^{-24} \ kg \ m/s$
- C$6.6 \times 10^{-44} \ kg \ m/s$
- D$2.2 \times 10^{-52} \ kg \ m/s$
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