Question

The de-Broglie wavelength of electron revolving in the nth orbit of Het ion is
6.648. The value of 'n' is -
1
2
2
(1)
(2)
(3)
(4)
3
4
2)
O 3)
O 4)​

Answer 1

Answer:

Velocity of the electron in He

+

ion in the n

th

=2.18×10

6

×

n

Z

m/s=

n

4.36×10

6

As λ=

mv

h

⟹m(

n

4.36×10

6

)×6.64×10

−10

=6.626×10

−34

⟹9.1×10

−31

×

n

4.36×10

−4

=10

−34

⟹n=0.91×4.36=4

The orbit is 4

th

orbit.