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प्रश्न
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?
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उत्तर
(i) As the bucket is filled the sound gradually increases.
(ii) Frequency ∝ 1/length; Resonance takes place.
संबंधित प्रश्न
What are mechanical waves?
Give one example to illustrate forced vibrations.
Differentiate between the forced and resonant vibrations.
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.
In Fig. A, B, C and D are four pendulums suspended from the same elastic string XY. The lengths of pendulum A and D are equal, while the length of pendulum B is shorter and of the pendulum C is longer. Pendulum A is set into vibrations.
- What is your observation about the vibrations of pendulum D?
- Give reason for your observation in part (a).
- What type of vibrations take place in pendulums Band C?
- Give reason for the answer in part (c).
Differentiate between the following:
Radio waves and light waves.
Explain why stringed musical instruments, like the guitar, are provided with a hollow box.
Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?
Explain Why are stringed musical instruments provided with large sound boxes?
