Waves Flashcards
What are sound waves known as?
Longitudinal waves
The denser the medium, the
faster the sound travels through it
What frequency of sound can human hear?
20-20 000Hz
The greater the amplitude the…
more energy and so the louder it is.
The higher the frequency the higher the…
pitch.
Frequency=
The number of complete vibrations per second
kHz is
1000Hz
MHz is
100000Hz
What sort wavelength does a high frequency sound produce?
a shorter wavelength
Sawtooth waveform
sloping ups and vertical downs or vice versa reates a buzzy brassy sound
Pulse wave
Rectangular peaks and troughs, makes a thin reedy sound.
square wave
Peaks the same length as trough, makes a hollow sound.
triangle wave
similar to sine waves but make a weaker more mellow sound.
What is ultrasound?
Sound with a higher frequency than we can hear.
What is meant by partial reflection?
When a wave passes from one medium to another some of the wave is reflected off the boundary and some is transmitted.