1.

If a_0 is the radius of first Bohr's orbit of H-atom, the de-Broglie's wavelength of an electron revolving in the 2nd Bohr's orbit will be

Answer»

`4pia_(0)`
`2pia_(0)`
`6pia_(0)`
NONE of these

Solution :`a_(0)=0.529xx(1^(2))/(1)`
`r_(a)=0.529xx(4)/(1)`
`r_(a)=4a_(0)`
`nlamda=2pir_(a)`
`=pi4a_(0)=4pia_(0)`.


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