In solar spectrum fraunhofer's lines are present because:

Definite absorption takes place in photosphere of sun

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Definite absorption takes place in chromosphere of sun

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These wavelengths are not at all emitted by the sun

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Nuclear reactions takes place in the sun

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Solution

The correct option is D Nuclear reactions takes place in the sun
In the solar spectrum, Fraunhofer's lines are present because the Nuclear reaction takes place in the sun.
The correct option is D.

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