Which one of the following is a unit of sound?

Correct option is B

​Correct Answer:(b) Decibel​

The decibel (dB) is the unit used to measure the intensity of sound. It is a logarithmic unit that expresses the ratio of a sound's power or pressure relative to a reference level. The decibel scale is commonly used because the human ear can detect a wide range of sound intensities.

Key Points about Decibel:

1. Logarithmic Scale: Each increase of 10 dB represents a tenfold increase in sound intensity.
2. Hearing Thresholds:
• 0 dB: Threshold of hearing.
• 60 dB: Normal conversation.
• 120 dB: Threshold of pain.
3. Applications: Used in acoustics, electronics, and communication to measure sound levels, signal strength, and noise.

Information Booster:

● Sounds above 85 dB can cause hearing damage with prolonged exposure.
● The decibel scale is based on the Bel, named after Alexander Graham Bell.
● A sound level meter is commonly used to measure sound in decibels.

Additional Knowledge:

• (a) Calories: Incorrect; calories measure energy, not sound.
• (b) Decibel: Correct; the unit of sound intensity.
• (c) Ampere: Incorrect; measures electric current.
• (d) Volt: Incorrect; measures electric potential difference.