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Hertz's Observations

A light beam ...

Question

A light beam consists of two types of photons. In one type, each photon has energy $2 e V$ and in other type, each photon has energy $3 e V$ . The light beam is incident on a photoelectric material of work function $1 e V$ . The maximum kinetic energy of emitted photoelectron is:

2 e V

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3 e V

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4 e V

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1 e V

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Solution

The correct option is B $2 e V$
Given,
work function of photoelectric material $(ϕ) = 1 e V$
We know that,
$K E_{m a x} = h v_{m a x} - ϕ$
$= 3 - 1 = 2 e V$ .

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2.0 W m^{- 2}

1.0 \times 10^{- 4} m^{2}

1 e V = 1.6 \times 10^{- 19} J

4000 ˚ A

2 e V

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