Advertisements
Advertisements
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?
Advertisements
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
Name the factor that determines Pitch of the note.
A person is standing at the seashore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. The person on the shore hears two sounds, 2 seconds and 3 seconds after seeing the smoke of the fired gun. If the speed of sound in the air is 320 ms-1 then calculate:
1) the distance between the observer on the ship and the person on the shore.
2) the distance between the cliff and the observer on the ship.
Figure shows two jars A and B containing water up to different heights. Which will produce sound of higher pitch when air is blown on them?
Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.
Name musical instrument, one in each case, which produces its notes by using the following. In each case state the method used to produce notes of different pitches and loudness.
(a) A vibrating string.
(b) A vibrating column air.
(c) Vibration of any other body.
Name the factors which determine the pitch of a note.
What is meant by the ‘pitch’ of a note? Does it depend on the loudness or ‘quality’ of the ‘note’? How is pitch ‘related’ with frequency?
Draw a diagram to show the waveforms of a pure note and a musical note, of the same pitch and same loudness.
Give scientific reason.
In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.
