The energy gap of an LED is $2.4 \, \text{eV}$. When the LED is switched 'on', the momentum of the emitted photons is:

Question

$1.28 \times 10^{-11} \, \text{kg} \cdot \text{m} \cdot \text{s}^{-1}$

$0.64 \times 10^{-27} \, \text{kg} \cdot \text{m} \cdot \text{s}^{-1}$

$1.28 \times 10^{-27} \, \text{kg} \cdot \text{m} \cdot \text{s}^{-1}$

$2.56 \times 10^{-27} \, \text{kg} \cdot \text{m} \cdot \text{s}^{-1}$

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