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)
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)
Question 2
A woman claps her hands 50 metres from a high wall. What time delay will there be before she hears the echo?
A woman claps her hands 50 metres from a high wall. What time delay will there be before she hears the echo?
Question 3
When does refraction causes sound to travel further over land?
When does refraction causes sound to travel further over land?
Summary
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