The maximum work function a metal can have so that the light from Balmer series can cause emission is

3.4 e V

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2.55 e V

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1.89 e V

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0.5 e V

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Solution

The correct option is A $3.4 e V$
For Balmar series: $n \geq 2$
The photon of maximum energy in Balmar series $= 13.6 - 10.2 = 3.4 e V$

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