Which has a higher energy, a photon of violet light with wavelength 4000˚A or a photon of red light with wavelength 7000˚A?
[h=6.62×10−34Js]
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Solution
We know that, E=hv=h⋅cλ Given, h=6.62×10−34Js, c=3×108ms−1 For a photon of violet light, λ=4000˚A=4000×10−10m E=6.62×10−34×3×1084×10−7=4.96×10−19J For a photon of red light, λ=7000˚A=7000×10−10m E=6.62×10−34×3×1087000×10−10=2.83×10−19J Hence, photon of violet light has higher energy than the photon of red light.