1.5 waves- sound

sound intensity

i, at a point is the rate at which sound energy is passing through an area at right angles to the direction in which the sound is travelling at that point

threshold of hearing

the smallest sound intensity detectable by the average human ear at a frequency of 1kHz. Its value is 1 x 10^-12 Wm^-2

sound intensity level (dB)

the relative sound intensity at any point in a sound field as compared with a specified standard intensity.

resonance

the transfer of energy between two bodies with the same natural frequency

standing wave

a wave whose amplitude profile at any point is constant and there is no net transfer of energy

coherent sources

sources of periodic waves with the same frequency and amplitude that are in phase, or there is a constant phase difference between them.

a node

where the amplitude is zero on a standing wave.

pitch

frequency

loudness

depends on amplitude