KCET 2018 Physics Solved Paper

Time period of revolution of electron is given as
T=

2πr

v

We know r∝n2 and v∝

1

n

⇒T∝n3
Time period of revolution in ground state = T
Time period of revolution in first excited state =T1∝23=8
Therefore,

T1

T

=8
⇒T1=8T