Question

Explain Pass by Noise measurement of Vehicle.

Answer 1

Decibels (dB) are expressed in a logarithmic scale. On the other hand, pitch describes the frequency of a sound and is measured in hertz (Hz). The main instrument to measure sounds in the air is the Sound Level Meter. ... Sound pressure is thus expressed in terms of dBA. 0 dBA is the softest level that a person can hear.

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Answer 2

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