The momentum of a photon is $2 \times 10^{-16} \text{ g} \cdot \text{cm/s}$. Its energy is:

  • A
    $0.61 \times 10^{-26} \text{ erg}$
  • B
    $2.0 \times 10^{-26} \text{ erg}$
  • C
    $6 \times 10^{-6} \text{ erg}$
  • D
    $6 \times 10^{-8} \text{ erg}$

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