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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsAtomic structureMedium2 minQB

PhysicsMediumsingle choice

An electron in a hydrogen atom first jumps from the second excited state to the first excited state and then from the first excited state to the ground state. Let the ratio of wavelength, momentum and energy of photons in the two cases be x, y and z. Then select the wrong answer:

Options:

Answer:

Solution:

$E_{1} = 13.6 (\frac{1}{4} - \frac{1}{9}) = 1.89 eV (3 \to 2); E_{2} = 13.6 (1 - \frac{1}{4}) = 10.2 eV (2 \to 1)$ . $x = λ_{1} / λ_{2} = E_{2} / E_{1} = 27/5; y = p_{1} / p_{2} = E_{1} / E_{2} = 5/27; z = E_{1} / E_{2} = 5/27 = 1/ x$ . Only $x = 9/4$ is wrong.

Subject:PhysicsTopic:Modern PhysicsSubtopic:Atomic structure

⏱ 2mℹ️ Source: QB

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