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Question
How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.
Solution
Resonance is the basis for radio tuning. You may alter the frequency of the electrical vibrations produced by them by adjusting the values of the individual components in the electronic circuits that make them up. Changing the values of a few electrical components causes vibrations at a frequency that matches the desired radio wave frequency, and that's all. When the two frequencies are in resonance with one another, the incoming waves carry the signal energy of the matching frequency. In the receiver set, the signal is then amplified.
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RELATED QUESTIONS
Define the Resonance phenomenon?
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In following figure shows A, B , C and D represent test tube each of height 20 cm which are filled with water up to heights of 12 cm, 14 cm, 16cm and 18cm respectively. If a vibrating tuning fork is placed over the mouth if test tube D, a loud sound is heard.
- Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.
- Give the reason for your observation in each case.
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In fig. shows two tuning forks P and Q of the same frequency mounted on separate sound boxes with their open ends facing each other. The fork A is set into vibration. (i) Describe your observation. (ii) State the principle illustrated by this experiment.
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What do you understand by free (or natural) vibrations?
