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Q.

Wave length of particular transition for H atom is 400 nm. What can be wavelength of He+ for same transition.

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a

400 nm

b

100 nm

c

1600 nm

d

200 nm

answer is B.

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Detailed Solution

v¯=1λ=RHz21n12-1n221λ∝z2λ1λ2=z22z12λHλHe+=2212λHe+=λH4=400/4 =100 nm
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Wave length of particular transition for H atom is 400 nm. What can be wavelength of He+ for same transition.