Question

When yellow light incident on a surface no electrons are emitted while green light can emit. If red light is incident on the surface then

• A. No electrons are emitted
• B. Photons are emitted
• C. Electrons of higher energy are emitted
• D. Electrons of lower energy are emitted

Answer 1

Answer: (A)

No electrons are emitted

Answer 2

$\lambda_{\text{Green}} < \lambda_{\text{Yellow}} < \lambda_{\text{Red}}$

According to the question $\lambda_{\text{Green}}$ is the maximum wavelength for which photoelectric emission takes place. Hence no emission takes place with red light