1. The deepest part of the ocean is the Marina Trench located in the Pacific Ocean, whose depth is 11033 m. If you were on a ship above this trench and send a sound signal straight down to the water, how long will it take for the Echo to reach you. Speed of sound in water is 1450 metre per second.
2. Find the time period of a pendulum which is vibrating at 12 Hz?
3. We can predict the arrival of a train by placing our ears on the rail without seeing it. How it is possible. Explain it.
4. The sound of thunder is heard after the lightning is seen.why?
5. What do you mean by the loudness of sound? On what what factors does the loudness of sound depends?
6. Show that sound is a non- electromagnetic wave.
7. In the outer space, a number of explosions and vibrations of material objects may be taking place all the time but they do not produce any effect on the human ears. Give the reason for this. Why should we consider this as a blessing in disguise for all life on the earth?
8. Give one example for the following:
A. Frequency of the sound produced may be changed without any change in its loudness.
B. Loudness Of the sound produced any significant change in its frequency.
9. How A vibrating body produces longitudinal waves in air.explain it with the example of a tuning fork.
10. Pendulum B makes 20 oscillations in 5 seconds and pendulum Q makes 8 oscillations in 4 seconds. Which has higher frequency? Express the frequency of each pendulum in Hz.
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