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प्रश्न
Differentiate between the following:
Light and sound waves.
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उत्तर
| Light waves | Sound waves |
| 1. These are electromagnetic waves. | 1. These are mechanical waves. |
| 2. They can travel in vacuum. | 2. They re qui re a materia I medium for propagation. |
| 3. The speed of light waves is very high ( = 3 x 108 m/s in air). | 3. The speed of sound waves is low ( =3 30 m/s in air). |
| 4. The wavelength of the light waves (visible) is very small, of the order of 10-6 m. | 4. The wavelength of sound waves is in the range of 10-2 m to lOm. |
| 5. These waves are transverse. | 5. These waves are lonaitud ina I waves. |
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संबंधित प्रश्न
Name the phenomenon involved in tunning a radio set to a particular station
Define the Resonance phenomenon?
What are mechanical waves?
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?
In following figure shows A, B, C and D are four pendulums suspended from the same elastic string XY. Lengths of pendulum A and D are equal, while the length of pendulum B is smaller and the pendulum C is longer. The pendulum A is set into vibration.
(a) what is your observation? (b) Give reason for your observation.
Two pendulums C and D are suspended from a wire as shown in the figure give below. Pendulum C is made to oscullate by displaying it from its mean position. It is seen that D also starts oscillating.
(i) Name the type of oscillation, C will execute.
(ii) Name the type of oscillation, D will execute.
(iii) If the length of D is made equal to C then what difference will you notice in the oscillations of D ?
(iv) What is the name of the phenomenon when the length of D is made equal to C ?
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.
When a tuning fork, struck by a rubber pad, is held over a length of the air column in a tube, it produces a loud sound for a fixed length of the air column. Name the above phenomenon. How does the frequency of the loud sound compare with that of the tuning fork? State the unit for measuring loudness.
