A helium-neon laser emits light of wavelength 632.8nm. Calculate the energy of each photon in electron volt.

Explanation

To calculate the energy of each photon emitted by a helium-neon laser with a wavelength of 632.8 nm, we can use the formula:

\[ E = \frac{hc}{\lambda} \]

Where:
- \( E \) is the energy of the photon,
- \( h \) is Planck's constant (\( 6.625 \times 10^{-34} \) Joules·seconds),
- \( c \) is the speed of light (\( 3 \times 10^{8} \) meters/second),
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