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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectHard2 minPYQ_2012

PhysicsHardsingle choice

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be $3.57 V$ . The threshold frequency of the material isNEET 2012 (Screening)

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Solution:

Energy released from emission of electron $E = (- 3.4) - (- 13.6) = 10.2 eV$ From photo electric equation. Work function $ϕ v v = E - e V = h v = \frac{E - e V}{h} = \frac{( 10.2 - 3.57 ) e}{6.67 \times 1 0 ^{- 34}} = \frac{6.63 \times 1.6 \times 1 0 ^{- 19}}{6.67 \times 1 0 ^{- 34}} = 1.6 \times 1 0^{15} Hz$

Stream:NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2012

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