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प्रश्न
State two ways in which resonance differs from forced vibrations.
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उत्तर
(i) In resonance it is necessary that the frequency of externally applied force should be equal to the natural frequency of the body whereas, it is not necessary for forced vibrations.
(ii) In forced oscillations, the amplitude of oscillations is small whereas, in resonance the amplitude of vibration is large.
संबंधित प्रश्न
How does the medium affect the amplitude of free/natural vibrations of a body?
Resonance is a special case of ______ vibrations, when frequency of the driving force is ______ natural frequency of the body.
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?
In fig. , P, Q, R and S represent test tubes each of height 20 cm which are filled with water upto heights of 10 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube Q, a loud sound is heard.
(i) Describe the observations with the tubes P, R and S.
(ii) Give the reason for your observation in each case.
(iii) State the principle illustrated by the above experiment.
A bucket kept under a running tap is getting filled with water. A person sitting at a distance is able to get an idea when the bucket is about to be filled.
(i) What change takes place in the sound to give this idea?
(ii) What causes the change in the sound?
The rearview mirror of a motorbike starts vibrating violently at some particular speed of the motorbike. What is the name of the phenomenon taking place? Why does the happen?
A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of the air column. What is the name of the phenomenon taking place when this happens? Why does the sound become the loudest?
Explain Why are stringed musical instruments provided with large sound boxes?
What are the factors that affect the frequency of a vibrating string and how do they affect the frequency?
