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    1. Light from a source having a continuous Spectrum shines on a mass of Hydrogen gas. What sort of spectrum would you see if you were (a) on the opposite side of the gas from the source ? (b) off to the side ? Explain.

    2. Two stars have the same temperature, but the absorption lines of one are narrower than the absorption lines of the other. What could be the reason for this ?

    3. An astronaut moves away from the Solar System at half the speed of light. Does the colour of the Sun change for him? Explain.

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    Answer-1: If we were on the opposite side of the gas from the source, we would see Hydrogen absorption spectrum, showing the characteristic Balmer series lines. ...

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