JEE PHYSICS MCQ: ATOMS

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Assertion (A): Laser is used to measure distant object as moon.

Reason (R): Lasers are highly coherent source of light.

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Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option A is correct because lasers are used for measuring distances due to their high coherence.

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The de-Broglie wavelength of an electron in the first Bohr orbit is The volume occupied by an atom is greater than the volume of the nucleus by a factor of about For a hydrogen atom, when electron jump from

n

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{n}=1

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\lambda_0

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\lambda_0

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{R_H} = 1.097\,\, \times \,\,{10^7}\,\,m

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