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Q.

Wavelength of emission from Hydrogen atom when electron jumps from fourth orbit to ground state is λ. What is the wavelength of emission coming from He+ ion when electron jumps from third orbit to ground state is

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a

135λ/512

b

147λ/412

c

87λ/512

d

127λ/488

answer is A.

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Detailed Solution

1λ=R1−142=15R16In He+, 1λ1=R221−132=32R9∴ λ1λ=15R16×932R⇒λ1=135512λ
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