why doesent the frequency increase the photoelectric current in the pe effect

since the fequency increases the kinetic energy of the photoelectrons ,

the rate of photo electrons reaching the electrode should increase too.

hence the photo current should increase .

but most of the books mention that the photo current does not increse due to the increase in frequency

why guys why!!??

where

• h is Planck's constant,


• f is the frequency of the incident photon,


• is the work function (sometimes denoted W instead), the minimum energy required to remove a delocalised electron from the surface of any given metal,


• is the maximum kinetic energy of ejected electrons,

So no of  electrons ejected does not depend upon f.

fequency increases the kinetic energy of the photoelectrons  - true.

But no of photoelectrons ejected depends upon no of photons incident.

relevent :

Experimental results of the photoelectric emission

1. For a given metal and frequency of incident radiation, the rate at which photoelectrons are ejected is directly proportional to the intensity of the incident light.


2. For a given metal, there exists a certain minimum frequency of incident radiation below which no photoelectrons can be emitted. This frequency is called the threshold frequency.


3. Above the threshold frequency, the maximum kinetic energy of the emitted photoelectron is independent of the intensity of the incident light but depends on the frequency of the incident light.


4. The time lag between the incidence of radiation and the emission of a photoelectron is very small, less than 10^-9 second.

The frequency increases the K.E. of the emitted electrons, but no. of electrons emitted depends upon the intensity of light. More intensity, more photons and hence, more emitted electrons .

Rate me, if useful.