What is the momentum of a photon with a frequency of $10^9 \ Hz$?

  • A
    $31 \ kg \ m/s$
  • B
    $7.3 \times 10^{-29} \ kg \ m/s$
  • C
    $2.2 \times 10^{-33} \ kg \ m/s$
  • D
    $6.6 \times 10^{-26} \ kg \ m/s$

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