The momentum (in $kg \cdot m/s$) of a photon having $6 \, MeV$ energy is:

  • A
    $3.2 \times 10^{-21}$
  • B
    $2.0$
  • C
    $1.6 \times 10^{-21}$
  • D
    $3.2 \times 10^{-18}$

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