Question

Fill in the blanks:
(i) sound travels at a ................... velocity than light.
(ii) when there lightning, we first................and then hear it .
(iii) SONAR makes use of...................waves whie RADAR makes use of...............waves.
(iv) microphone converts sound into....................while speaker converts eletric signal into..................​

Answer 1

Answer:

1. lower

2.saw

3.ultra sonic and infrasonic

4 electrical signals and mechanical energy