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Question1
A boat fitted with sonar is on a lake. It detects an echo 60ms after sending out a pulse. How deep is the lake? (Speed of sound in water = 1500m/s)
30m
45m
150m
253m
Question 2
A woman claps her hands 50 metres from a high wall. What time delay will there be before she hears the echo?
0.15 seconds
3.1 seconds
0.50 seconds
0.30 seconds
Question 3
When does refraction causes sound to travel further over land?
Day
Night
Holidays
SummarySummary

 

 

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