What are the uses of ultrasonic sound waves?
A per can bear sound at frequency upto 120KHZ Determine the wave length oi sound in an a
speed of sound as 344m/s.
c) Define supersonic boom.
s
Answers
(a)
The following are the main properties of ultrasonic waves:
Ultrasonic flaw detection. Cutting and matching of hard materials. Ultrasonic soldering and welding.
Their velocity remains constant in homogeneous media.
These waves can weld certain plastics, metals etc.
These can produce vibrations in low viscosity liquids.
(b)
c = ν λ ..... ............ eq 1
ν is frequency and λ is wavelength , c is the speed of sound .
ν = 120 KHz , c = 344
λ = c/ν
= 344 / 120000
= 28.33 * 10⁻⁴ m
(c)
A sonic boom is the sound associated with the shock waves created whenever an object travelling through the air travels faster than the speed of sound. Sonic booms generate enormous amounts of sound energy, sounding similar to an explosion or a thunderclap to the human ear