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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

When the momentum of a photon is changed by an amount $p'$ , the corresponding change in the de-Broglie wavelength is found to be $0.2 %$ . Then, the original momentum of the photon was

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Answer:

Solution:

$∵ λ = \frac{h}{p}$

$∴ λ \propto \frac{1}{p}$

$\Rightarrow \frac{Δ p}{p} = - \frac{Δ λ}{λ}$

$∴ |\frac{Δ p}{p}| = |\frac{Δ λ}{λ}|$

$\Rightarrow \frac{p^{'}}{p} = \frac{0.20}{100} = \frac{1}{500}$

$\Rightarrow p = 500 p^{'}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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