Question

1. Name one musical instrument each in which the sound is produced:a. By vibrating a stretched string. c. By vibrating a stretched membrane.b. By vibrating air enclosed in a tube.
2.What is the – a) unit to express loudness of sound. b) unit to express frequency of sound.
3.Distinguish between - Audible and inaudible sound.
4.A pendulum makes 20 oscillations in one second. Calculate its frequency in Hz.
5.The sound from an insect is produced when it vibrates its wings at an average rate of 500 vibrations per second.a) What is the frequency of the vibrations in hertz? b) What is the time period of the vibrations.Can we hear this sound? Why or why not?
6.When we put our ear onto a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why?
7. Explain why, if we strike a steel tumbler with a metal spoon lightly, we hear a feeble sound but if we hit the tumbler hard, a loud sound is heard?
8.The town hall building is very close to Vipin’s house. There is a clock on the top of the town hall building, which rings the bell every hour. Vipin noticed that the sound of the bell appears to be much clearer at night. Why?
9.Which of the sounds having the following frequencies can be heard by the human beings and which cannot?(a) 6 hertz(b) 5000 hertz(c) 10000 hertz(d) 35000 hertz.
10.What differences will you hear in a sound if there is an increase in(i) amplitude, and(ii) frequency?
20 points

Answer 1

Answer:

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Answer 2

Explanation:

Explain why, if we strike a steel tumbler with a metal spoon lightly, we hear a feeble sound but if we hit the tumbler hard, a loud sound is heard?

8.The town hall building is very close to Vipin’s house. There is a clock on the top of the town hall building, which rings the bell every hour. Vipin noticed that the sound of the bell appears to be much clearer at night. Why?

9.Which of the sounds having the following frequencies can be heard by the human beings and which cannot?(a) 6 hertz(b) 5000 hertz(c) 10000 hertz(d) 35000 hertz.

10.What differences will you