Sound waves are longitudinal waves that must pass through a medium, such as air. Echoes are reflections of sounds. The frequency of ultrasound is above 20 kHz. Ultrasound is useful for cleaning.
Which waves are fastest?
What type of waves are sound waves?
What part of the ear collects sounds?
What is the diaphragm in a telephone most like?
What is the amplitude of a wave?
The distance between the same two points on a wave
The maximum height of the wave
The number of waves per second
What is the wavelength of a wave?
What is the frequency of a wave?
In which does sound travel fastest?
Above what frequency is ultrasound?
10 000 Hz
20 000 Hz
What do we use ultrasound for?
Taking photos of unborn babies
Taking photos of jewellery