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Q. The energy of a photon of green light of wavelength $5000 \,\mathring{A}$ is

Dual Nature of Radiation and Matter

Solution:

$E=h c / \lambda=6.6 \times 10^{-34} \times 3 \times 10^8 / 5000 \times 10^{-10}$
$=3.973 \times 10^{-19} J$