A stream of photons having energy 3 eV e...

A stream of photons having energy 3 eV each impinges on a potassium surface. The work function of potassium is 2.3 eV. The emerging photo-electrons are slowed down by a copper plate placed 5 mm away. If the potential difference between the two metal plates is 1 V, the maximum distance the electrons can move away from the potassium surface before being turned back is–

A

`3.5 mm`

B

`1.5 mm`

C

`2.5 mm`

D

`5.0 mm`

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A

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