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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2020

PhysicsEasysingle choice

In photoelectric effect, the threshold wavelength of sodium is $5000 Å$ . Find its work function $(h = 6.6 \times 10^{- 34} J s, c = 3 \times 10^{8} {m s}^{- 1}, 1 eV = 1.6 \times 10^{- 19} J)$

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Answer:

Solution:

The work function of sodium

$W = \frac{h c}{λ_{0}}$

$W = \frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{5 \times 10^{- 7}}$

or $W = 3.96 \times 10^{- 19} J$

or $W = 2.5 e V$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2020

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