?
(c) What is SONAR? Write its full form.
Answer:
(a) There are three characteristics of sound waves such as
(i) Loudness (ii) Pitch
(iii) Quality or timbre
(b) Time taken by an echo to be heard, t = 3 s
Speed of sound, 
Total distance, 2d = v x t = 342 x 3 == 1026 m
Distance of the reflecting surface from the source, 
(c) SONAR is a technique used for detecting and finding
the distance, direction and speed of objects under water using ultrasonic
waves.
The acronym SONAR stands for Sound Navigation And
Ranging.
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