Advertisements
Advertisements
प्रश्न
Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?
Advertisements
उत्तर
When the frequency of the engine of motorbike corresponds with the natural frequency of the rear view mirror, die resonance takes place. Thus, the rearview mirror vibrates with a larger amplitude violently.
संबंधित प्रश्न
The diagram above shows a wire stretched over a sonometer. Stems of two vibrating tuning forks A and Bare touched to the wooden box of the sonometer. It is observed that the paper rider (a small piece of paper folded at the centre) present on the wire flies off when the stem of vibrating tuning fork B is touched to the wooden box but the paper just vibrates when the stem of vibrating tuning fork A is touched to the wooden box.
1) Name the phenomenon when the paper rider just vibrates.
2) Name the phenomenon when the paper rider flies off.
3) Why does the paper rider fly off when the stem of tuning fork B is touched to the box?
How does the medium affect the amplitude of free/natural vibrations of a body?
What are forced vibrations?
Differentiate between the following:
Free and forced vibrations.
The diagram below shows three different modes of vibration P, Q and R of the same string of a given length.
 |
 |
 |
| P | Q | R |
- Which vibration will produce a louder sound and why?
- Which vibration will produce sound of maximum shrillness (or pitch) and why?
- What is the ratio of wavelength of vibrations P and R?
When acoustic resonance takes place, a loud sound is heard. Why does this happen? Explain.
A string stretched between its ends is made to vibrate by placing the stem of a vibrating tuning fork at its one end. State three ways how you will increase the frequency of note produced by the string.
What do you understand by forced vibrations?
Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
