Which of the following statement(s) is/are true?
i. The study of emission or absorption spectra is referred to as spectroscopy.
ii. The spectrum of radiation emitted by a substance that has absorbed energy is called an emission spectrum.
iii. The element helium (He) was discovered in the sun by a spectroscopic method.
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A.
ii only
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B.
i only
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C.
iii only
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D.
i, ii and iii
Correct Answer:
D. i, ii and iii
Explanation:
Spectroscopy is the scientific study of how substances emit or absorb radiation. When a material absorbs energy and subsequently releases it as radiation, the resulting pattern is known as an emission spectrum. In the history of science, the element helium was first identified through spectroscopic observations of the sun before it was found on Earth. Since all three statements provided are accurate, the correct answer is option D.
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