JEE PHYSICS MCQ: ATOMS

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Assertion: The phenomenon of X-ray production is basically inverse of photoelectric effect.

Reason: X-rays are electromagnetic waves.

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Correct option: B

If both assertion and reason are true and reason is not correct explanation of assertion.

Option B is correct because both the assertion and reason are true, but the reason doesn't explain the assertion. X-ray production is the inverse of the photoelectric effect, and X-rays are electromagnetic waves.

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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

, first and second wavelength of Balmer series in hydrogen spectrum is When hydrogen atom is in its first excited level, its radius is its ground state radius