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  • Solve it, The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

  • Option 1)

    Curves (1) and (2) represent incident radiations of same frequency but of different intensities.

  • Option 2)

    Curves (2) and (3) represent incident radiations of different frequency and different intensities.

  • Option 3)

    Curves (2) and (3) represent incident radiations of same frequency having same intensities.

  • Option 4)

    Curves (1) and (2) represent incident radiations of different frequencies but of different intensities.

 

Answers (1)

As we learnt in 

Stopping Potential /Cut-off Potential -

It is defined as the potential necessary to stop any electron from reaching the other side.

-

 

 Stopping potential is related to frequency and saturation current is related with intensity of radiation.

\therefore Intensity of (2) & (3) is same and frequency of 1 and 2 is same.


Option 1)

Curves (1) and (2) represent incident radiations of same frequency but of different intensities.

Correct

Option 2)

Curves (2) and (3) represent incident radiations of different frequency and different intensities.

Incorrect

Option 3)

Curves (2) and (3) represent incident radiations of same frequency having same intensities.

Incorrect

Option 4)

Curves (1) and (2) represent incident radiations of different frequencies but of different intensities.

Incorrect

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Vakul

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