Advertisements
Advertisements
प्रश्न
Can you hear each other in a dark room?
Advertisements
उत्तर
Yes, we can hear in the darkroom.
APPEARS IN
संबंधित प्रश्न
The bees do not have voice-boxes. How do they produce sound ?
Describe a simple experiment to determine the speed of sound in air. What approximation is made in the method described by you?
Match the pairs.
| Group ‘A’ | Group ‘B’ |
| (a) Flute | (1) Frequency less than 20 Hz |
| (b) Frequency | (2) Frequency more than 20000 Hz |
| (c) Sound level | (3) Vibrations in the air |
| (d) Ultrasonic sound | (4) Measured in Hz |
| (e) Infrasonic sound | (5) Decibel |
Name the Sound of the Frequency Given Below:
200 Hz
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. |
Sound can travel through solids, gases, liquids, and even vacuum.
The sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given the speed of sound = 340 m s–1.)
Name two musical instruments which produce sound by vibrating strings.
Assertion: The sound of thunder is heard a little later than the flash of light.
Reason: The speed of sound is much less than the speed of light.
Find the odd one out.
