Question

A strong pulse created at one end of a string is observed to complete 6 up and
down journey along its length before fading out. If the pulse takes 12 second to
complete this journey and the length of the string is 5 metre the speed of the
pulse through the string is
(a) 0.5 ms (b) 1.0 ms (b) 5 ms (d) 10 ms
2.
Write the frequency range of the following :-
(a) Audible Range (b) Ultrasound (c) Infrasound
Name one example for each of the following :-
(a) Mechanical Wave (b) Electromagnetic Wave (c) Reflection of Sound
Which of the following is transmitted in a wave motion
(a) Energy (b) Mass (c) particle (d) Amplitude
A key of a mechanical piano is first struck gently and then struck again but much
harder this time. In the second case
(a) sound will be louder but pitch will remain unaffected (b) sound will be louder
and pitch will also be louder (c) sound will be louder but pitch will be lower (d)
both loudness and pitch will remain unaffected
6.
For the formation of distinct echo the distance between the sound source and the
reflecting surface must be at least
(a) 10 m (b) 17 m (c) 34 m (d) 100 m
7.
What is reverberation? How can it be reduced ?
OR
(a) Explain how bats use ultrasound to catch a prey?
(b) A sonar device on a submarine sends out a signal and receives an echo 5
second later. Calculate the speed of sound in water if the distance of the object
from the submarine is 3625 m.
8.
Explain the various parts and the function of human ear with a labelled diagram.




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Answer 1

Answer:

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Explanation:

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