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..................
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2
Answer:
1. lower
2.saw
3.ultra sonic and infrasonic
4 electrical signals and mechanical energy
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