Question

Threshold wavelength for lithium metal is 6250 Å. For photoemission, the wavelength of the incident light must be ______.

Options

• More than 6250 Å

• Exactly equal to 6250 Å

• Equal to or more than 6250 Å

• Equal to or less than 6250 Å

Answer 1

Threshold wavelength for lithium metal is 6250 Å. For photoemission, the wavelength of the incident light must be Equal to or less than 6250 Å.

Explanation:

Condition for photoemission: `lambda <= lambda_0`