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PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2020

PhysicsEasysingle choice

Sodium and copper have work functions $2.3 eV$ and $4.5 eV$ respectively. Then the ratio of the threshold wavelengths is nearest to

Answer:

Solution:

Work function = $\frac{h c}{λ}$

$\frac{W_{N a}}{W_{C u}} = \frac{λ_{C u}}{λ_{N a}} = \frac{4.5}{2.3} = \frac{2}{1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2020

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