Chapter 8&9 - Longitudinal Waves & Sound Flashcards
what’s a longitudinal wave
disturbance of medium is in the same direction as the direction in which wave travels
what’s compression
section of the longitudinal wave where particles of medium move closer to each other
what’s rarefaction
section of longitudinal wave where particles of medium move further apart form each other
what’s an oscilloscope
instrument used to present the info received from a longitudinal wave on a graph looking like a transverse wave
what’s an echo
when sound is reflected & you can hear reflected sound as separate sound
will be lower in volume cause energy is lost
what’s reverberation
if reflected sound persists for a short while after sound is made
what’s acoustic
quality of absorption on energy that eliminates the reflected sound or that allows the reflected sound to continue
what’s sonar
sound navigation and range finding
whaats ultrasound
high frequency waves
what’s intensity
amount of energy that’s transferred over an area of 1 square meter in one second measured in desibels
what’s music
repetition of regular vibrations
what’s noise
repetition of irregular vibrations
what’s pitch
describes whether a sound is low or high
high pitch = high frequency
low pitch = low frequency
what’s loudness
amount of energy that is transferred between particles of a medium
determined by amplitude
bigger amplitude = harder sound
smaller amplitude = softer sound
gives characteristics of sound
- can’t travel thro vaccum - needs medium
- longitudinal waves are shown as transverse waves - oscilloscope
- sounds waves are pressure waves
- can move through solid, liquid / gas but fastest thro solid
name places where echo is used
- stethoscope & megaphone
- sonar - location device
- geographical prospecting
- ultrasound
- echo location
