Question

Two different sources of light A and B have wavelength 0.7 μm and 0.3 μm respectively. Then which of the following statement is true

1. Both has equal energy
2. A has greater energy then B
3. None of the above
4. B has greater energy then A

Answer 1

Hey deepika,

Accordind to PLANCK-EINSTEIN formula

E=hf
where h is planck's constant
and f is frequency

Since velocity=wavelength×frequency
so frequency=velocity/wavelength

We get E=h×velocity/wavelength

So E is inversely proportional to wavelength

Hence B wave has more energy than A.

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