Option 1 is ans

Dear Student,
​​​​​​Answer to your question is given below:

The stopping potential is defined as the negative potential of the collector plate at which the photoelectric current becomes zero. Stopping potential is that value of retarding potential difference between two plates which is just sufficient to halt the most energetic photoelectrons emitted. Therefore only OA represents on the negative x-axis. Hence OA is the stopping potential. Thus option (1) is the correct choice.

Regards,

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