Question

can someone plz give me the numerical questions of physics of sound class 8th plz I didn't got from google so can someone plz send at least 10 questions plz plz plz plz plz pzl​

Answer 1

Answer:

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1. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency ?

2. The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration ?

3. A simple pendulum makes 20 oscillations in 40 seconds. What is the time period and frequency of its oscillation ?

4. Sonali heard sound of thunderbolt 5 second after she saw flash of lightning. How far is she from the place where lightning occurs? (speed of sound = 330 m/s).

5. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute ?

6. A person fires a gun standing at a distance of 55 m from a wall. If the speed of sound is 330 ms-1, find the time for an echo to be heard ?

7. The pulse rate of a man is 80 beats in one minute. Calculate its frequency ?

8. Prove that: v = fλ, where the symbols have their usual meanings ?

9. A stone js dropped into a well 44 m deep and the sound of splash is heard after 3.12 sec. Find the speed of sound in air ?

10. A person standing between two vertical cliffs and 640 m away from the nearest cliff shouted. He heard the first echo after 4 seconds and the second echo 3 seconds later. Calculate the velocity of sound in air ?

Explanation:

Hope this may help you....

- Tanvi.

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