Advertisements
Advertisements
प्रश्न
Differentiate between the following:
Radio waves and light waves.
Advertisements
उत्तर
| Radio waves | Light waves |
| 1. Radio waves are not visible to hum an eye. | 1. Light waves are visible to human eye. |
| 2. These waves range from 105 to 10-3 meters. | 2. These waves range from 10-6 to 10-7 meters. |
| 3. Frequency of radio waves is below 107 Hz. | 3. Frequency of light waves lie in the range 1014 to 1013 Hz. |
| 4. Its sources are TV and radio transmitters. | 4. Its sources are sunlight, white hot bodies. |
APPEARS IN
संबंधित प्रश्न
Distinguish between the free (or natural) and forced vibrations.
Why is a loud sound heard at resonance?
When a troop crosses a suspension bridge, the soldiers are asked to break steps. Explain the reason.
How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.
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. , 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.
The rearview mirror of a motorbike starts vibrating violently at some particular speed of the motorbike, what could be done to stop the violent vibrations.
What do you understand by free (or natural) vibrations?
