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PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2020

PhysicsEasysingle choice

Radiations of two photon's energy, twice and ten times the work function of metal are incident on the metal surface successively. The ratio of maximum velocities of photoelectrons emitted in two cases is

Options:

Answer:

Solution:

$\frac{1}{2} m v_{1}^{2} = 2 ϕ_{0} - ϕ_{0} = ϕ_{0}$ and $\frac{1}{2} m v_{2}^{2} = 10 ϕ_{0} - ϕ_{0} = 9 ϕ_{0}$

$∴ \frac{v_{1}}{v_{2}} = \sqrt{\frac{ϕ_{0}}{9 ϕ_{0}}} = \frac{1}{3}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2020

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