Spectroscopy — the use of light from a distant object to work out the object is made of — could be the single-most powerful tool astronomers use, says Professor Fred Watson from the Australian Astronomical Observatory. ... "It lets you see the chemicals being absorbed or emitted by the light source.
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Answer: A</h2>
Explanation because the distance covered is equal time intervals is the same or equal.
Answer:
a soft foam material because soft materials absorb sound better
