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PhysicsModern PhysicsPhotoelectric effectMedium2 minPYQ_2014

PhysicsMediumsingle choice

A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are u₁and u₂, respectively. If the ratio $u_{1} : u_{2} = 2 : 1$ , the work function of the metal is nearly

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Answer:

Solution:

$\frac{\frac{h c}{λ_{1}} - ϕ}{\frac{h c}{λ_{2}} - ϕ} = \frac{u_{1}^{2}}{u_{2}^{2}}$
$ϕ = 3.7 e V$

Stream:JEE_ADVSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2014

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