Question

In a ferromagnetic material, the velocity of ultrasound is 5.03 x 105 cm/s. The length of
the rod is 3 cm. Calculate the frequency of ultrasonic waves produced by it.
​

Answer 1

The frequency is 176.05 Hz.

• Ultrasonic waves are sound waves with a frequency greater than 20 kHz. The human ear cannot hear these sound waves. High-amplitude ultrasound waves are referred to as sonic.
• Animals that depend on ultrasonic waves to survive include bats and dolphins. Ultrasound-frequency noises are made by bats. The bat hears the echo of these noises as they are transferred. They may calculate the target's distance using the time difference between the sent sound and the echoes that are returned, as well as the angle at which the echoes are reflected. Similar to humans, dolphins interact with one another and understand their environment by using ultrasound.

Here, according to the given information, it is given that,

The velocity of ultrasound (v) = 5.03 x 105 cm/s.

Also, length of the rod (l) =  3 cm.

Then, Then, frequency f = $\frac{v}{l}=\frac{5.03.105}{3} = 176.05 Hz$.

Hence, the frequency is 176.05 Hz.

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