Question

# In an experiment of photoelectric emission, for incident light of 4000˚A, the stopping potential is 2V. If the wavelength of incident light is made 3000˚A, then stopping potential will be

A
Less than 2 volt
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B
More than 2 volt
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C
2 volt
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D
Zero
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Solution

## The correct option is A More than 2 voltThe maximum kinetic energy for the photoelectrons is Emax=hν−ϕwhere, ν is the frequency of incident light and ϕ is photoelectric work function of metal.If Vo is the stopping potential theneV0=hcλ−ϕ .....................(since, ν=cλ)As per the problem, for incident light of 4000A∘, the stopping potential is 2V. When the wavelength of incident light is reduced to 3000A∘, then the stopping potential will increase to value more than 2V(as per the above equation).So, the answer is option (B).

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