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| Frage | Antworten |
| what is ultrasound? | sounds with frequencies higher than 20,000 Hz |
| What do we use ultrasound for? | foetus scanning to make an image sonar-detecting surroundings communication between animals-bats and dolphins |
| what equation do you use to work out distance? | distance=velocity x time |
| if the speed of sound in seawater is 1520 m/s and the pulse takes 4.5 seconds, how far away is the submarine from the sea bed? | 1520 x 4.5= 6840 THEN DIVIDE BY TWO answer= 3420 m |
| what is infrasound? | a sound with frequencies less than 20 Hz |
| which animals use infrasound to communicate? | elephants and also tigers |
| what two natural occurrences produces infrasound | meteor strikes and volcanic eruptions |
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