27. a) Name the characteristic of sound that helps us to distinguish a note played on a sitar and a
violin
b) In a submarine fitted with a SONAR, the time interval between the generation of an
ultrasonic wave and the receipt of its echo from an enemy submarine is 200 sec. what is
distance of the enemy submarine? Given: speed of sound in water is 1450m/s.
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Answer:
1) quality which is also known as timbre.
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a) The quality of sound that helps to distinguish a note played on sitar and a violin is Timbre.
b) Time = 200 seconds (Given)
Speed = 1450 m/s(Given)
Let the distance from enemy submarine be = x
Let the distance covered by wave in water = 2x
Velocity = Distance / Time
Total distance covered by sound wave in water = Velocity of sound wave × time
= 1450 × 200 = 2x
x = 1450 × 200 / 2
= 1450 × 100
= 145000 m
= 145 km
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