Echo Sounding and Sonar - GCSE Physics
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- เผยแพร่เมื่อ 2 เม.ย. 2020
- This video introduces echo sounding and sonar. This is how fishermen detect fish, how submarines don't bump into the sea floor and how bats find their prey. Sometimes its called echolocation.
A sound wave is emitted which reflects off of objects surrounding the boat. The boat then detects this reflected sound wave. If we know the speed of sound in the medium, we can calculate the distance between us and the object.
The speed of sound multiplied by the time it takes to get there and back gives the distance that the sound wave has travelled. In order to calculate the distance of the object, we have to halve this. Therefore, distance = ½ x speed of sound x time, s = ½ vt.
Thanks for watching,
Lewis
Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy) (Physics Higher only)
Edexcel (Physics Higher only)
CCEA
OCR A (Physics Higher only)
OCR B (Physics Higher only)
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