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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
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When sound travels in form of a wave
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Give scientific reason for the following:
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A 0.6 m long stretched wire is made to vibrate in two different modes as shown in figure
(a)
(b)
(i) If the frequency of the note produced in (b) is n, what is the frequency in case (a)?
(ii) In which case (a) or (b), is the note louder? Give reasons.
(iii) In which case is the pitch higher? Give reason.
