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An electron is moving in 3rd orbit of Hy...

An electron is moving in 3rd orbit of Hydrogen atom and radius of first orbit is x then

A

de-Broglie wavelength is 6`pix`

B

de-Broglie wavelength is 2`pix`

C

velocity of electron is `h/6pixm`

D

velocity of electron is `h/2pixm`

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