Question

Define superposition principle and echo.​

Answer 1

Answer
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✳️superposition principle:-

✍️Geology The principle that in a group of stratified sedimentary rocks the lowest were the earliest to be deposited. Physics The combination of two or more physical states, such as waves, to form a new physical state in accordance with the superposition principle.✔️

✳️echo:-

✍️Echo sounding is a type of sonar used to determine the depth of water by transmitting sound waves into water. ... Echo sounding can also refer to hydroacoustic "echo sounders" defined as active sound in water (sonar) used to study fish.✔️✔️
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Answer 2

$\bold {Answer}$

$1. \: superposition \: principle$

It states that when two or more waves of same nature travel in a $\bold {medium}$than the resultant of displacement is vector sum of displacement due to individual wave.

$2. \: echo$

It is defined as repetition of sound of short duration. It is heard if minimum distance between the obstacle reflecting sound waves of the source of sound is 70 cm.

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