science - sound

Class 8 - Science

Sound

Q&A
Notes
Question:
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?
Answer:

The time required to complete one oscillation is known as time period. It is given by the inverse of the frequency. Time period = 1/(Frequency of Oscillation) Frequency of oscillations = 500 Hz Time period = 1/500 = .002 s

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Questions and Answers


Sound - Questions
1. 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?
Answer
2. Identify the part which vibrates to produce sound in the following instruments.(a) Dholak (b) Sitar (c) Flute
Answer
3. What is the difference between noise and music? Can music become noise sometimes?
Answer
4. Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house wouid you suggest your parents should buy? Explain your answer.
Answer
5. Sketch larynx and explain its function in your own words.
Answer
6. List sources of noise pollution in your surroundings.
Answer
7. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.
Answer
8. Explain in what way noise pollution is harmful to humans.
Answer
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