Advertisements
Advertisements
Question
When a gun is fired at a distance, why is it that the flash is seen almost instantaneously while the sound is heard a little later?
Advertisements
Solution
The reason is that the speed of light in air is 3 × 108 ms−1 which is much larger as compared to the speed of sound in air 3 × 102 ms−1. Hence light takes almost negligible time in comparison to sound in reaching us from the gun.
RELATED QUESTIONS
What is an echo
In a longitudinal wave, compression and rarefaction are formed.
The pitch of a stringed instrument is increased by .................. tension in string.
If a drum is beaten hard, its loudness ................
What is longitudinal wave?
Name the characteristic of the sound affected due to a change in its
(a) amplitude (b) waveform (c) frequency.
How does the wave pattern of a loud note differ from a soft note? Draw a diagram.
The diagram below shows three ways in which the string of an instrument can vibrate.
(i) Which of the above diagrams shows the fundamental note?
(ii) Which has the frequency 4 times that of the fundamental?
(iii) State the ratio between the frequency of the first and second.
Two waves of the same pitch have their amplitudes in the ratio 2 : 3.
(i) What will be the ratio of their loudness?
(ii) What will be the ratio of their frequencies?
What is acoustics?
