Q.

The radius of the second orbit of an electron in hydrogen atom is 2.116 A0. The de-Broglie wavelength associated with this electron in this orbit would be

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a

6.64 A0

b

1.058A0

c

20116 A0

d

13.28 A0

answer is A.

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Detailed Solution

mvr=2h2ππr=hmV=hp=λ,      3.14×2.116=6.64AO
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The radius of the second orbit of an electron in hydrogen atom is 2.116 A0. The de-Broglie wavelength associated with this electron in this orbit would be