Q.

The de Broglie wavelength of the electron in the first Bohr orbit of the hydrogen atom is

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a

equal to the diameter of the first orbit

b

equal to the circumference of the first orbit

c

equal to half the circumference of the first orbit

d

independent of the size of the first orbit

answer is B.

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Detailed Solution

λ=hp=hmv and mvr=h2π solving we get λ=2πr
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The de Broglie wavelength of the electron in the first Bohr orbit of the hydrogen atom is