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Answer:
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Answer:
1.C
2.
3.B
Explanation:
1.The number of vibrations per second is known as the frequency, measured in Hertz (1 Hz = 1 vibration per second).
2.Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB)
3.The highest surface part of a wave is called the crest, and the lowest part is the trough. ... The horizontal distance between two adjacent crests or troughs is known as the wavelength.