Question

A sound wave emitted by a vibrator has a frequency of 40000 Hz:
(i) Name the type of wave.​

Answer 1

The type of the wave is ultrasonic wave.

Ultrasonic waves have frequency above 20,000 Hz.

Answer 2

Ultrasonic Wave.

Sound waves having frequency between 20 Hz to 20000 Hz are called sonic waves.

Sound wave having frequency greater 20000 Hz are called ultrasonic waves.

Therefore, sound wave emitted by a vibrator having frequency of 40000 Hz is  

ultrasonic waves.

Additional Information :

Humans can only listen sound wave having frequency in sonic range .

Hence, this is the required solution.

Learn More :

Sound wave.

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