Question

Which of the following relations between loudness and intensity is correct?

Answer 1

Answer:

Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity of the sound waves. Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB).

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Answer 2

Answer:

Correct option is: c) L & log I

L ∝ log I Loudness is related to intensity by the relation L log I, where L denotes sound volume and I denotes sound intensity.

Explanation:

loudness and intensity:

While intensity is solely a physical quality, the loudness of a sound is the degree of sensation that depends on both the intensity of the sound and the sensitivity of the eardrums.

• A sound's intensity is calculated by dividing its power, measured in Watts, by the area it covers, measured in square meters. Any given sound's intensity is related to its intensity at the hearing threshold by its loudness. Decibels are used to measure it (dB).
• The intensity of the human hearing threshold is approximately.$0000000000001$ watts per meter squared, or$0$decibels. Humans have a pain threshold of 1 Watt per meter squared, or $120$ decibels.
• A car horn at one meter is approximately 110 dB, a vacuum cleaner is approximately $70$ dB, a lawn mower is approximately 90 dB, and a whisper is between $20$ and $30$ dB.
• The frequency range between $2000$ and $5000$ Hertz is where humans are most sensitive to sound. As with human hearing, the dBA scale has a filter that makes the sound level meter less sensitive to low and high frequency sounds.
• Additionally, it is more suitable for evaluating human speech interference and hearing loss.