How do spectrographs help astronomers classify stars? A.They determine the size of stars. B.They evaluate the color of stars. C.They measure the brightness of stars. D.They analyze the composition of stars.
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D) They analyze the composition of stars.
Explanation:
- A spectrograph is an instrument which measures the different wavelength of light and represents it in the form of a spectrogram.
- The astronomers use the spectrographs to classify the stars on the basis of the composition of the elements present in them.
- The element present in them absorbs all the wavelengths of light and reflects back the wavelength which is not absorbed by the element. This is measured by the spectrograph and the spectrogram is measured.
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Answer:
D
Explanation:
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