Assertion Bamer series lies in the visble region of electromagnetic spectrum.
Reason `(1)/(lambda)=R((1)/(2^(2))-(1)/n^(2))` , where n = 3, 4, 5,.....

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false

Answer

A

Explanation

The wavelength in Balmer series is given by `(1)/(lamda) = R [(1)/(2^(2))- (1)/(n^(2))], n= 3, 4, 5...`
`(1)/(lamda_("max"))= R [(1)/(2^(2))- (1)/(3^(2))]`
`lamda_("max") = (36)/(5R) = (36)/(5 xx 1.097 xx 10^(7))= 6563 Å and (1)/(lamda_("min")) = R [(1)/(2^(2))- (1)/(oo^(2))]`
`lamda_("min") = (4)/(R ) = (4)/(1.097 xx 10^(7)) = 3646 Å`
The wavelength `6563 Å and 6563 Å` lie in visible region. Therefore, Balmer series lies in visible region