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प्रश्न
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?
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उत्तर
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.
संबंधित प्रश्न
How does sound travel in air?
Define the following term:
Frequency
Name the characteristic of sound related to its frequency
Explain the following and illustrate your answer by drawing appropriate diagram:
Frequency
Name the factors which determine the loudness of a note.
Which characteristics of sound will change if there is a change in its amplitude and its waveform.
How is it possible to detect the filling of a pitcher under a tap by hearing its sound at a distance?
Two musical notes of the same pitch and loudness are played on a violin and a piano. Their waveforms are as shown in the figure below:
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?
