Question

When green light is made incident on a metal, photoelectrons are emitted by it but no photoelectrons are obtained by yellow light. If red light is made incident on that metal then

• A. No electrons will be emitted
• B. Less electrons will be emitted
• C. More electrons will be emitted
• D. All of the above

Answer 1

The correct option is A No electrons will be emitted

When green light is made incident on a metal, photoelectrons are emitted by it, this means frequency of green light is the threshold frequency. This is the minimum frequency due to which electron is able to knock out of the surface of metal.
The frequency of light is inversely proportional to the wavelength of light.
Since, the wavelengths of yellow and red light are more than green light, their frequencies are lesser than green light hence, no photoelectrons will emitted when yellow or red light made incident on metal.

So, the answer is option (A).