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PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

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How many min photons of wavelength 550nm are required if energy required to see an object by a person is $1 0^{- 17} J$ .

Answer:

Solution:

$E_{γ} = \frac{h c}{550 \times 1 0 ^{- 9}} ≃ 3.61 \times 1 0^{- 19} J N_{m i n} = ⌈ \frac{1 0 ^{- 17}}{E _{γ}} ⌉ = ⌈ 27.67 ⌉ = 28$

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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