1.

Assertion Second orbit circumference of hydrogen atom is two times the de-Broglie wavelength of electrons in that orbit Reason de-Broglie wavelength of electron in ground state is minimum.A. If both Assertion and Reason ar true and Reason is the correct explanation of Assertion.B. If both Assertion and Reason are true but Reason is not correct explanation of AssertionC. If Assertion is true by Reason is false.D. If Assertion is false but Reason is true.

Answer» Correct Answer - B
`mv_(2)r_(2)=2((h)/(2pi))`
`:.2pir_(2)=2((h)/(mv_(2)))=2lambda_(2)`
Further `lambda=(h)/(p)`
Speed of momentum is maximum is ground state. Hence `lambda` is minimum


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