i) Differentiate between the terms supersonic and ultrasonic.
1) State two uses of ultrasound.
Answers
Answer:
Ultrasonic :A sound wave transmitted at a frequency greater than 20,000 hz per second, or beyond the normal hearing range of humans. The specific wavelength is equal to the velocity divided by the frequency
uses:ultrasonic motion detectors use same ultrasonic
waves in measuring distance,Ultrasonic sound waves are also used for the purpose of welding plastic.Few animals such as bats and frogs have the ability to use
ultrasound to communicate with each other.
Supersonic speed is the rate of travel which exceeds the speed of sound, also referred to as Mach 1 speed.
Since the speed of sound depends on temperature and composition of air, supersonic speed also varies
with changing altitudes. In water at room temperature, it is greater than 1440 m/s, while in solids it is even more. An example of supersonic is, a bullet fired from a gun. Fighter planes and space shuttle also fly at
these speeds. Concorde is the only passenger aircraft to travel at such speeds. It took its last flight in 2003 and it is not in use now.
Answer:
Ultrasonic is a reference to the frequency of sound waves beyond (above) the human hearing range. ... Supersonic is an adjective that describes the speed of something moving faster than sound. The measure of magnitude is mach. So twice the speed of sound is mach two.
Ultrasonic sound vibrations are used for:
scanning of internal organs of a human body.
welding metals like tungsten which cannot be welded by conventional methods.
dissipating fog on th runways of the airports.
vibrating water and detergent in dish washing machines.
detecting defects in metal blocks.
homogenising milk.