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Q.

What will be the longest wavelength line in the Balmer series of spectrum of H atom?

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a

656 nm

b

546 nm

c

566 nm

d

556 nm

answer is B.

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Detailed Solution

Using the formula:

1λ=RZ21n12-1n22

Value of R is 1.097×10-2 nm-1   and for hydrogen, Z=1.

n1 is 2 for Balmer series and for determining longest wavelength, minimum wavelength is considered because energy is inversely proportional to the wavelength.

1λ=1.097×10-2 nm-1×12×122-132 λ=656 nm

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