A. beats
B. doppler effect
C. acoustic resonance
D. echo
Correct Answer: Option A
A. beats
![A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560m/s]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560m/s]")
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