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PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

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Light of wavelength $5000 \overset{˚}{A}$ is falling on a photosensitive surface. If the surface has received $1 0^{- 7} J$ of energy, then the number of photons striking the surface will be

Options:

Answer:

Solution:

Energy of each photon is $\frac{h c}{λ}$ .

$E = \frac{nh c}{λ}$

$n = \frac{E λ}{h c}$

$n = \frac{1 0 ^{- 7} ( 5000 \times 1 0 ^{- 10} )}{( 6.6 \times 1 0 ^{- 34} ) ( 3 \times 1 0 ^{8} )}$

$n ≃ 2.5 \times 1 0^{11}$

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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