soundwaves Flashcards
what is sound
a compressional wave with travels through the air
what are compressions
they vibrate outwards and molecules push together
what are rarefactions
the vibrate inwards and the molecules spread apart
what is wavelength in sound
one compression/ rarefaction to another
what can sound travel through
all states of matter
what does sound travel as
vibrations
what is pitch related to
frequency
whats the range a healthy human ear can hear
20- 20,000 hertz
what is infrasonic
sounds below 20 hertz
what is ultrasonic
sounds above 20,000 hertz
what is the doppler effect
the apparent change in frequency when sound is moving to the hearer
why do we perceive sounds as louder
because the amplitude is higher
what is the speed of sound
not constant and depends on the medium
