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  4. The number of de Broglie wavelengths contained in the second Bohr orbit of Hydrogen atom is

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Q. The number of de Broglie wavelengths contained in the second Bohr orbit of Hydrogen atom is

Atoms

Solution:

$\because 2\pi r_n = n\lambda$
$\therefore n = 2, 2\pi r_2 $
$= 2\lambda = 2\times $ de Broglie wavelength.