1. We hear with the help of our ears. Explain with the help of a diagram.
2. List three characteristics of sound.
3. Differentiate between the following:
(a) Amplitude and frequency of waves
(b) Stringed and percussion instruments
4. What do you understand by noise pollution? What can we do to reduce it?
5. Sound needs a medium to travel. Prove.
Answers
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Answer:
1. When the sound waves hit the eardrum, it vibrates and the signal is sent through the auditory nerve to the brain. This process is also called hearing.
2. The three characteristics of sound are pitch, loudness and tone.
3.(a) Amplitude :
The maximum displacement of an object from its central position is called Amplitude
Frequency of waves :
The number of oscillations per second is called the frequency of waves. Frequency is expressed in hertz (Hz).
(b) Stringed instrument :
The instruments which produce sound when the strings of it are vibrated is called stringed instruments.
Percussion instruments :
Instruments which are played by hitting or shaking are called Percussion instruments.
4.Presence of excessive and unwanted in sound in the environment is called noise pollution.
Measures taken for noise pollution :
- Silencing devices
- Noisy operations should be conducted away from the residential areas
- Use of automobile horns should be reduced
- TV and music system volume should be low
- Planting trees around the residential areas
5. When we make noise in a vacuum we may not be able to hear sound, this prove that sound needs a medium to travel. This could be a solid liquid or gas. The best medium is solid.
Explanation:
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