An LED is constructed from a p-n junction diode using Ga As P. The energy gap is 1.9 eV. The wavelength of the light emitted will be equal to

• A

  $654\times {10}^{-11} \mathrm{m}$

• B

  $10.4\times {10}^{-26} \mathrm{m}$

• C

  654 nm

• D

  $654 \stackrel{\mathrm{o}}{\mathrm{A}}$