TEKS: P.8B/D Sound Waves

Doppler effect

• The change in the frequency of sound or light caused by the movement of either the source, the detector, or both the detector and the source.

• A phenomenon where sound waves are amplified due to the motion of the source.

• The increase in pitch of a sound as it approaches and decreases as it recedes.

• A visual effect observed when light waves are bent due to gravity.

Decibel

• A unit of measurement for sound level, abbreviated as dB.

• A type of musical note.

• A measure of temperature in Celsius.

• A unit for measuring distance.

Sound level

• A linear scale that measures sound frequencies; unit of measurement is the hertz (Hz).

• A logarithmic scale that measures sound intensities; depends on the ratio of the intensity of a particular sound wave to the intensity of the most faintly heard sound; unit of measurement is the decibel (dB).

• A measure of the loudness of a sound based on human perception; unit of measurement is the phon.

• A scale that measures the duration of sound waves; unit of measurement is the second (s).

Loudness

• Sound intensity as sensed by the ear and interpreted by the brain; depends mainly on the pressure wave’s amplitude.

• The frequency of sound waves that determines the pitch of a sound.

• The quality of a sound that allows it to be distinguished from other sounds.

• The speed at which sound waves travel through different mediums.

Pitch

• The loudness of a sound, which depends on the amplitude of vibrations.

• The quality of a sound that distinguishes it from other sounds.

• The highness or lowness of a sound, which depends on the frequency of vibrations; can be given a name on the musical scale.

• The duration of a sound, which refers to how long it lasts.

Sound wave

• A type of electromagnetic wave that travels through a vacuum.

• A pressure variation transmitted through matter as a longitudinal wave; it reflects and interferes and has frequency, wavelength, speed, and amplitude.

• A wave that can only travel through solids and not through liquids or gases.

• A type of wave that is always audible to the human ear.