Given the value of Rydberg constant is `10^(7)m^(-1)`, the waves number of the lest line of the Balmer series in hydrogen spectrum will be:

Options

A. `0.025 xx 10^(4) m^(-1)`
B. `0.5 xx 10^(7) m^(-1)`
C. `0.25 xx 10^(7) m^(-1)`
D. `2.5 xx 10^(7) m^(-1)`

Answer

C

Explanation

Wave number `= (1)/(lamda) = R ((1)/(2^(2))- (1)/(oo)) xx 1^(2)`
`rArr` Wave number ` = (10^(7))/(4)= 0.25 xx 10^(7) m^(-1)`