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# Ultrasonic Waves

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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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This Solution contains over 100 words and calculations to aid you in understanding the Solution to these questions.

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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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