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Q.

Find the ratio of wavelengths of the emitted photons when an electron jumps from state n to ground state in hydrogen atom and in singly ionized helium atom.

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a

4 : 1

b

1 : 4

c

2 : 1

d

1 : 2

answer is A.

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Detailed Solution

From Bohrs theory we know that λ∝1Z2 where λ is wavelength and Z is the atomic number⇒λHλHe=ZHe2ZH2⇒λHλHe=2212⇒λHλHe=41

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Find the ratio of wavelengths of the emitted photons when an electron jumps from state n to ground state in hydrogen atom and in singly ionized helium atom.