An LED is constructed from a p-n junction diode using $\text{GaAsP}$. The energy gap is $1.9\text{eV}$. The wavelength of the light emitted will be equal to:

1. A
   $10.4\times 10^{-26}\text{m}$
2. B
   $654\text{nm}$
3. C
   $654\text{m}$
4. D
   $654\times 10^{-11}\text{m}$