Ultrasonic Waves
Please answer all questions with full explanations
1) An ultrasound wave has frequency 100 kHz and wavelength (in air) of 3.5mm. What is the speed of these ultrasonic waves?
2) 3mm wavelength radar waves have speed 3.00 x 10(8) ms(-1) (as do all electromagnetic waves in air) what is their frequency?
3) Ultrasound is a longitudinal wave motion; radar waves are transverse. Explain the terms longitudinal & transverse.
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Solution Preview
There is a relation who connects the wavelength, frequency and velocity of waves.
nu * lambda = velocity
nu is the frequency and lambda is the wavelength.
from this, the velocity = 100kHz * 3.5mm
= 100*10^3 * 3.5 * 10^-3
= 350 ...
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