Discussion
The dark lines in the solar spectrum are due to
Answer: A
The dark Fraunhofer lines in the solar spectrum are caused by the absorption of particular wavelengths by the sun's cooler outer layers.
The hot interior emits a continuous spectrum; atoms in the photosphere and chromosphere above absorb exactly the wavelengths they would themselves emit, leaving dark lines. Their positions identify the elements present - which is how helium was discovered.
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