Unit 7 · Energy in Daily LifeIntensity of Sound
Words of this topic
- Intensity of sound: the amount of energy sound waves carry away from the source in one second.
- Loudness of sound: how strong a sound seems to the ear, measured in decibels.
- Decibel: the unit for measuring the loudness of sound, written in short as dB.
- Watt per square metre (W/m²): the SI unit for measuring the intensity of sound.
- Sound power (P): the power carried by sound waves, measured in watt (W).
- Amplitude: the greatest distance a vibrating body moves away from its resting position.
- Frequency: the number of vibrations completed in one second.
- Density: the amount of matter in one unit of volume of a medium.
- Hard of hearing: the condition of not hearing sound in the range from 40 dB up to 65 dB.
- Deaf: the condition of not hearing even sound up to 80 dB.
- Threshold of pain in hearing: a loudness of 120 to 140 dB, where sound starts to hurt the ear.