Class 12PhysicsDual Nature of Radiation and MatterPhotoelectric Effect by Lenard and it's Observations
MediumDefine threshold frequency and on which factor does threshold frequency depend?
(N/A) The minimum frequency of incident radiation required to eject electrons from a metal surface is called the threshold frequency. It is denoted by $\nu_0$.
The value of the threshold frequency depends solely on the nature of the metal (the work function of the material).
For most metals,such as zinc,cadmium,and magnesium,the threshold frequencies lie in the ultraviolet region,which corresponds to short wavelengths.
For alkali metals,such as lithium,sodium,potassium,caesium,and rubidium,the threshold frequencies lie in the visible region.
The value of the threshold frequency depends solely on the nature of the metal (the work function of the material).
For most metals,such as zinc,cadmium,and magnesium,the threshold frequencies lie in the ultraviolet region,which corresponds to short wavelengths.
For alkali metals,such as lithium,sodium,potassium,caesium,and rubidium,the threshold frequencies lie in the visible region.
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Similar Questions
The work functions of Caesium $(Cs)$, Potassium $(K)$, and Sodium $(Na)$ are $2.14\,eV$, $2.30\,eV$, and $2.75\,eV$ respectively. If incident electromagnetic radiation has an incident energy of $2.20\,eV$, which of these photosensitive surfaces may emit photoelectrons?
MediumNEET 2023
View SolutionChoose the correct option for the given statements:
Statement-$I$: The kinetic energy of photoelectrons emitted by a photosensitive surface depends on the intensity of the incident radiation.
Statement-$II$: In the photoelectric emission process,the maximum kinetic energy of the photoelectrons increases with increasing intensity of the incident light.
Statement-$I$: The kinetic energy of photoelectrons emitted by a photosensitive surface depends on the intensity of the incident radiation.
Statement-$II$: In the photoelectric emission process,the maximum kinetic energy of the photoelectrons increases with increasing intensity of the incident light.
Medium
View SolutionThe work function of a metal is
Easy
View SolutionIf the intensity of incident radiation in a photocell is increased, the stopping potential
The following graph represents the variation of photocurrent with anode potential for a metal surface. Here $I_{1}, I_{2}$ and $I_{3}$ represent intensities and $\gamma_{1}, \gamma_{2}, \gamma_{3}$ represent frequencies for curves $1, 2$ and $3$ respectively,then
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