VITEEE 2017 Paper

Number of possible spectral lines emitted when an electron jumps back to ground state from nth orbit =

n(n−1)

2

Here,

n(n−1)

2

= 6 ⇒ n = 4
Wavelength λ from transition from n = 1 to n = 4 is given by,

1

λ

= R (

1

1

−

1

42

) ⇒ λ =

16

15R

= 975 Å