Sound Multiple Choice Physics Question

Question

Which of the following conditions is generally used to describe a sound as "ultrasonic"?

A. v_object > 5v_sound

B. f_sound < 20,000 Hz

C. v_object > v_sound

D. f_sound > 20,000 Hz

Answer 1

The range of human ear audio frequency is generally taken as 20Hz to 20,000 Hz

Frequency less than 20Hz is not detectible by human ear is called infrasonic

Frequency higher than 20,000 Hz ( 20KHz) is also not detectible by human ear and thus comes in ulrasonic range

Option D is correct