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. `0.025xx10^(4)m^(-1)`
B. `0.5xx10^(2)m^(-2)`
C. `0.25xx10^(7)m^(-1)`
D. `2.5xx10^(7)m^(-3)`

Explanation

`1/(lamda)=RZ^(2)"1/(n_(2)^(2))-1/(n_(1)^(2))}`
`=10^(7)xx1^(2){1/(2^(2))-1/(oo)^(2))}`
`=0.25xx10^(3)m^(-1)`