Question

Which of the following statement is not correct.

• 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

Answer 1

Answer: (D)

Infrared photons have more energy than photons of visible light

Answer 2

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