Question

The following data show the values of the speed of sound (in m/s) through
medium A, B, C and D:
Medium
Speed of Sound (m/s)
A
3000 (m/s)
B
330 (m/s)
C
0(m/s)
D
1500 (m/s)
i Why is the speed of sound through medium C 0(m/s)?
(ii) Identify the most probable physical state of A. Give reason for your
answer.
(iii) Which of the four media could be 'air?​

Answer 1

First is vacuum because sound is a longitudinal wave and can't travel through vacuum