Dual Nature Of Light Question 229

Question: Which of the following statement is not correct [AFMC 1999]

Options:

A) Photographic plates are sensitive to infrared rays

B) Photographic plates are sensitive to ultraviolet rays

C) Infra-red rays are invisible but can cast shadows like visible light

D) Infrared photons have more energy than photons of visible light

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Answer:

Correct Answer: D

Solution:

$ E\propto \frac{1}{\lambda }; $ also $ {\lambda_{infrared}}>{\lambda_{visible}} $ so $ {E_{infrared}}<{E_{visible}} $