Threshold wavelength lithium metal is 6250mathring - A - - For photo emission- the wavelength of the incident light must be -Exactly equal to 6250mathring - A - More than 6250mathring - A - Equal to or than 6250mathring - A - Equal to or than 6250mathring - A -

Question

Toppr Admin · Accepted Answer

The correct option is D Equal to or less than $6250 ˚ A$
The threshold wavelength of a material signifies that if the photons of energy corresponding to this wavelength or higher strike onto the material, they will undergo photo electric effect. As the energy of a photon is inversely proportional to wavelength $(E = \frac{h c}{λ})$ , the photonic wavelength should be less than equal to threshold wavelength.
Option-D is correct

Threshold wavelength for lithium metal is 6250˚A. For photo emission, the wavelength of the incident light must be ___________.Exactly equal to 6250˚AMore than 6250˚AEqual to or more than 6250˚AEqual to or less than 6250˚A

Threshold wavelength for lithium metal is $6250 ˚ A$ . For photo emission, the wavelength of the incident light must be ___________.
Exactly equal to $6250 ˚ A$
More than $6250 ˚ A$
Equal to or more than $6250 ˚ A$
Equal to or less than $6250 ˚ A$