Question

reading check

1. identify what is the unit used to measure loudness?

scientists usually use the unit decibel (db) to measure loudness. soft sounds have low decibel levels. loud sounds have high decibel levels. the table below shows the decibel levels of some common sounds.

decibel level	sound
20	whisper
25	purring cat
60	loudness of a normal speaking voice
80	lawn mower, vacuum cleaner, loud traffic
100	chain saw, snowmobile
115	sandblaster, loud music concert, car horn
120	sound that is loud enough to cause pain
140	jet engine 30 m away
200	rocket engine 50 m away

Explanation:

The text in the image states that scientists use the unit decibel (dB) to measure loudness. By directly reading the relevant sentence, we can identify the unit.

Answer:

decibel (dB)