Explanation: None. 7. What are periodic changes in pressure that propagate through the air?
A. Air waves
B. Sound waves
C. Rate
D. None of the mentioned
Answer:A
Explanation: None. 7. What are periodic changes in pressure that propagate through the air?
A. Air waves B. Sound waves C. Rate D. None of the mentioned
Explanation: Sound waves are periodic changes in pressure that propagate through the air and it can be measured by a microphone. 8. What is called as the properties of the signal that extend over interval?