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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2004

PhysicsEasystatement

The work function of a substance is $4.0 eV$ . Then longest wavelength of light that can cause photoelectron emission from this substance approximately

Options:

Answer:

C

Solution:

$\frac{hc}{λ} = W$ $λ_{longest} = \frac{hc}{W} = \frac{6.6 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}}{4.0 \times 1.6 \times 1 0 ^{- 19}}$ $\Rightarrow λ_{longest} \approx 310 nm$ .

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2004

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