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10 terms

Grade 4 Energy of Sound Vocabulary

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Amplitude
The height of a sound wave. It determines the volume of a sound and the strength of the vibration which causes the sound.
Vibration
A back and forth motion.
Volume
The loudness or softness of a sound.
Decibels
A unit for measuring the loudness of volume.
Frequency
The number of times molecules of matter vibrate within an interval of time.
Hertz
A unit of frequency equal to one cycle per second. Pitch can be described in terms of these.
Law of conservation of energy
A principle which states that energy is neither created nor destroyed, it simply changes form.
Pitch
The lowness or highness of a sound dependent on the frequency of sound waves.
Sound energy
The energy of vibrating molecules.
Sound waves
Vibrations that pass through solids, liquids or gases.