Question

Wavelength of ultrasonic waves in air is of the order of :

Answer 1

Explanation:

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Answer 2

The wavelength of ultrasonic waves in air is of the order of 1.7cm.

• The frequency of the ultrasonic wave is taken as 20KHz and the speed of the ultrasonic waves in the air is taken as 340ms-1.
• The formula for measuring wavelength is
• $wavelength \: = \frac{speed}{frequency} = \frac{340}{2000} = 0.017m \: = 1.7cm$
• Ultrasonic waves have frequencies higher than those audible for normal hearing and the frequency of ultrasonic waves can damage the eardrum or lead to impairment in hearing.