18. How much is the increase in the speed of sound in the air for every increase in temperatung
0.00
1.0.6 m/s c. 6 m/s d. Gom/
19. Speed of sound depends on the
a pressure of ihe medium
c. temperature of the source producing sound
b. temperature of the medium d. temperature and humidity of the medium
20. The reverberation of sound is used in​