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if the wavelength of the first line of t...

if the wavelength of the first line of the balmer series of hydrogen is `6561 Å`, the wavelength of the second line of the series should be

A

`(27)/(20) xx 4861 Å`

B

`(20)/(27) xx 4861 Å`

C

`20 xx 4861 Å`

D

` 4861 Å`

Text Solution

Verified by Experts

The correct Answer is:
A

`(1)/(lambda_(2)) = R [(1)/(2^(2)) - (1)/(2^(2))]`
`(1)/(lambda_(2)) = R [(1)/(4) - (1)/(16)]`
`(1)/(lambda_(2)) = R [(3)/(16)] or lambda_(2) =(16)/(3 R)`
Again `(1)/(lambda_(1)) = R [(1)/(2^(2)) - (1)/(3^(2))]`
`(1)/(lambda_(1)) = R [(1)/(4) - (1)/(9)]`
`(1)/(lambda_(1)) = R (5 R)/(36) or - lambda_(1) = (36)/(3 R)`
`(lambda_(1))/(lambda_(2)) = (36)/(3 R) xx (3 R)/(16) = (27)/(20)`
or `lambda_(1) = (27)/(20) xx 4861 Å`
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Knowledge Check

  • If the wavelength of the first line of the Balmer series of hydrogen is 6561 Å , the wavelngth of the second line of the series should be

    A
    `13122 Å`
    B
    `3280 Å`
    C
    `4860 Å`
    D
    `2187 Å`
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