JEE PHYSICS MCQ: ATOMS

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Assertion (A): If the impact parameter is alarge in Rutherford experiment the deviation of the

\alpha

particle is small.

Reason (R): Impact parameter is the initial perpendicular distance between the velocity direction and nucleus.

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Correct option: B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

Option B is correct because both the assertion and reason are true, but the reason does not correctly explain the assertion. The deviation is small because the alpha particle is far from the nucleus, and the impact parameter is defined as the perpendicular distance.

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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

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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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