Advertisements
Advertisements
प्रश्न
The time interval between a lighting flash and the first sound of thunder was found to be 6 s. If the speed of sound in air is 330 ms-1, find the distance of the flash from the observer.
Advertisements
उत्तर
The distance of the flash from the observer = speed in air x time taken for the first sound to reach
330 x 6 = 1980m
APPEARS IN
संबंधित प्रश्न
Select the correct alternative :
We can hear sound of frequency
On what factor does the loudness of a sound depend ?
At 20°C, the minimum distance of a person from a sound reflecting surface to hear an echo is :
Arrange the speed of sound in gases Vg, solids Vs and liquids VLin an ascending order.
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
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 |
The distance between one crest and one trough of a sea wave is 4.5 m. If the waves are produced at the rate of 240/min, calculate the time period.
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through ______.
The speed of sound in air at 0°C is ______.
Distinguish between compression and rarefactions.
