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For the case discussed above,the wavelength of light emitted in the visible region by He + ions after collisions with H atoms is

1. 6.5 × 10 – 7 m
2. 5.6 × 10 – 7 m
3. 4.8 × 10 – 7 m
4. 4.0 × 10 – 7 m

Correct answer: 4.8 × 10 – 7 m

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