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Q.

The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be:

(Rydberg constant =1.097×10τm−1)

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a

406 nm 

b

192 nm

c

9.1×10−6nm

d

91 nm

answer is A.

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Detailed Solution

It is known that;

1λ=RH112−1∞2

⇒λ=912Å

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