Here's the solution.
Hope it helps.
The wavelength of the radiation having 0.25 E is 2400 nm.
The relation between energy and wavelength of light is given by Planck's equation, which is:
E = energy of the light
h = Planck's constant
c = speed of light
= wavelength of light
When , then the equation becomes:
When E = 0.25 E, the wavelength is taken as , the equation becomes:
Taking ratio of 1 and 2, we get:
Hence, the wavelength of the radiation having 0.25 E is 2400 nm.
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