Advertisements
Advertisements
प्रश्न
On placing your ear close to an iron railing which is tapped some distance away, sound is heard twice. Explain, why?
Advertisements
उत्तर
The sound produced by the moving wheels of the train travels faster on the iron track than in the air. So, firstly sound produced because of railway track is heard and then heard in the air.
APPEARS IN
संबंधित प्रश्न
Why are sound waves called mechanical waves?
How does a bat make use of ultrasonics waves to find its way?
How does a man’s voice differ from a woman’s voice ?
Why are musical instruments provided with more than one string ?
For which range of frequencies, human ears are most sensitive?
A bat emits an ultrasonic sound of frequency 0.25 MHz. Calculate the time in which one vibration is completed.
The amplitude of the sound wave decides its
Consider the statement given below and choose the correct option.
Assertion: When lightning strikes, the sound is heard a little after the flash is seen.
Reason: The velocity of light is greater than that of the sound.
Match the following.
| 1. | Tuning fork | The point where density of air is maximum |
| 2. | Sound | Maximum displacement from the equilibrium position. |
| 3. | Compressions | The sound whose frequency is greater than 20,000 Hz. |
| 4. | Amplitude | Longitudinal wave. |
| 5. | Ultasonics | Production of sound. |
