Question

The loudness of sound is measured in units of

• A. Decibel (dB)
• B. Hertz (Hz)
• C. Meter
• D. Meter/second (m/s)

Answer 1

The correct option is A

Decibel (dB)

Explanation for correct option:

Option A: Decibel (dB)

1. The intensity of a sound is the power of the sound in watts divided by the area the sound covers in square meters.
2. The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing.
3. It is measured in decibels (dB).
4. Hence, option A is correct.

Explanation for incorrect option(s):

Option B: Hertz (Hz)

1. Hertz is the SI unit of frequency.
2. It can be used to measure the frequency of sound but not the loudness of sound.
3. Hence, option B is incorrect.

Option C: Meter

1. Meter is the SI unit of length.
2. It is in no way related to the loudness of sound.
3. Hence, option C is incorrect.

Option D: Meter/second (m/s)

1. Meter/second is the unit of velocity.
2. It is in no way related to the loudness of sound.
3. Hence, option D is incorrect.

Thus, option A is the correct answer.