Assertion: A negative potential is required to stop photoelectrons. Reason: The speed of an electron decreases when a negative retarding potential is applied in a photocell.
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Assertion: A negative potential is required to stop photoelectrons. Reason: The speed of an electron decreases when a negative retarding potential is applied in a photocell.

G1 Physics · Accepted Answer

A negative retarding potential opposes emitted photoelectrons and reduces their kinetic energy. At the stopping potential even the most energetic photoelectrons are stopped. Thus both statements are correct.