Q.

The longest wavelength of a spectral line in Balmer series of hydrogen spectrum is

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a

956 nm 

b

656 nm

c

124 nm

d

1526 nm 

answer is D.

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Detailed Solution

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1λ=109677122132(1)2cm1
1λ=6.564×105cmλ=6.56.4×109m
λ=656.4nm

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