Waves Flashcards
Wave
oscillation, cause transfer energy, displacement around a point
Transverse wave
particles’ vibrations are perpendicular to direction of energy transfer
Wave length
distance 2 corresponding points
Frequency
number of waves passing a fixed point per second
Period
time taken for a wave to pass a fixed point
Amplitude
maximum displacement of oscillation from equilibrium
Longitudinal wave
particles’ vibrations are parallel to the direction of energy transfer
Compression
area where particles are squeezed together
Rarefraction
area where particles are stretched apart
Wave speed equation
v = f x wavelength
Ripple tank
vibrating wave creates waves, lamp, freeze frame for frequency and length
Are EM waves transverse of longitudinal?
transverse
Electromagnetic wave
vibrations through a vacuum
Mechanical waves
Vibrations through a medium
Sound waves
longitudinal, 20-20,000Hz
Why do speed waves travel at a higher speed in a more dense medium?
frequency is a constant
What is frequency proportional to?
pitch
Volume is proportional to. . .
Amplitude
How to detect sound
defined space, make sound, detect echo, measure time, 2d/ t
Process of hearing
vibrations in air, eardrum, ear bones, cochlear hairs, auditory nerve
Microphone process
sound vibrations, pressure flexible diaphragm, coil, voltage, current flows
Ultrasound
20kHz, cleaning jewellery, industrial imaging (diffuse?), echolocation, medical imaging (partial reflection)
Why is medical imaging safe?
waves are partially reflected, not absorbed + limited exposure
