The wavelength of a 1 keV photon is 1.24 × 10 - 9 m. What is the frequency of 1 MeV photon?

h c λ = 1000 eV h v = 10 6 e V ⇒ λ ν c = 1000 eV ⇒ v = 3 × 10 8 × 1000 1 . 2 × 10 - 9 = 2 . 5 × 10 20 Hz

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PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2020

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The wavelength of a 1 keV photon is $1.24 \times 10^{- 9}$ m. What is the frequency of 1 MeV photon?

Answer:

Solution:

$\frac{h c}{λ} = 1000 eV$

$h v = 10^{6} e V$

$\Rightarrow \frac{λ ν}{c} = 1000 eV$
$\Rightarrow v = \frac{3 \times 10^{8} \times 1000}{1.2 \times 10^{- 9}} = 2.5 \times 10^{20} Hz$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2020

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