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प्रश्न
Explain how sound is produced by your school bell.
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उत्तर
When the school bell vibrates, it forces the adjacent particles in the air to vibrate. This disturbance gives rise to a wave, and when the bell moves forward, it pushes the air in front of it. This creates a region of high pressure known as compression. When the bell moves backwards, it creates a region of low pressure known as rarefaction. As the bell continues to move forward and backward, it produces a series of compressions and reactions. This makes the sound of a bell propagate through the air.
संबंधित प्रश्न
What is sound and how is it produced?
What is the general name of the waves consisting of :
(a) compressions and rarefactions?
(b) crests and troughs?
What will be the change in the wavelength of a sound wave in air if its frequency is doubled?
How does sound from a sound producing body travel through air to reach our ears? Illustrate your answer with the help of a labelled diagram.
A device called oscillator is used to send waves along a stretched string. The string is 20 cm long, and four complete waves fit along its length when the oscillator vibrates 30 times per second. For the waves on the strings.
(a) what is their wavelength?
(b) what is their frequency
(c) what is their speed?
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing rang. This note must then be passing through.
A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case :
Different sound notes have different ______.
The vibrations of a simple pendulum are also known as _______.
Describe an experiment to show that sound cannot travel through vaccum.
