The ratio of energies of photons with wavelengths $2000 A^{0}$ and $4000 A^{0}$ is:

1/4

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1/2

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Solution

The correct option is D 2
$E n e r g y \propto \frac{1}{w a v e l e n g t h} [E = \frac{h c}{λ}]$
$r a t i o = \frac{\frac{1}{2000}}{\frac{1}{4000}} = 2$

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