27. How could you determine when a mechanical wave is being propagated?
A. A physical medium is disturbed
B. Light is observed or visible
C. No medium required
D. When there is television signal
A. A physical medium is disturbed
B. Light is observed or visible
C. No medium required
D. When there is television signal
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Answer:
A. A physical medium is disturbed
Explanation:
Mechanical wave, if I'm not mistaken, is the oscillation of matter, and therefore, it requires a medium. Unlike electromagnetic waves, they cannot propagate through a vacuum. In order to determine if it is a mechanical wave, one must observe if the wave is traveling through matter or vacuum. Hence, a is the answer. Hope it helps, and a "brainliest" is appreciated!