Question

Ultrasonic, infrasonic and audio frequency waves travel through a medium with speeds $v_u, v_i$ and $v_a$ respectively, then

• A. $v_u = v_i = v_a$
• B. $v_u > v_a > v_i$
• C. $v_u < v_a < v_i$
• D. $v_a < v_u$ and $v_i = v_a$

Answer 1

Answer: (A)

a)

Answer 2

For waves traveling in the same medium, the speed depends only on the medium’s properties and not on the frequency. Hence, ultrasonic, infrasonic, and audio frequency waves all travel with the same speed in a given medium.

Speed of sound in a medium is independent of frequency → $v_u = v_i = v_a$.