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प्रश्न
Give examples of forced vibrations.
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उत्तर
- When the stem of a vibrating tuning fork is pressed against the top of a table, the tuning fork forces the table top to vibrate with its own frequency. The vibrations produced in the tabletop are forced vibrations.
- When a guitar is played, the vibrations produced by the strings of the guitar are the forced vibrations.
संबंधित प्रश्न
What are mechanical waves?
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.
- State the principle illustrated by the above experiment.
Why are the stringed instruments like guitar provided with a hollow sound box?
A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency:
Differentiate between the following:
Free and forced vibrations.
Differentiate between the following:
Radio waves and light waves.
Give two examples of forced vibrations.
Explain a tuning fork (vibrating) is held close to ear. One hears a faint sound. The same vibrating tuning fork is placed on table, such that its handle is in contact with table, one hears a loud sound.
What do you understand by free vibrations of a body? Draw a displacement-time graph to represent them. Given one example.
Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
