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How there is phase difference in interference of light...?

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This modified formula (eqn. 8.6) gave the correct (iii) humidity, and (iv) direction of wind. value of the speed of sound. At N.T.P. in air, taking (i) Effect of density : From relation and . comes out to be nearly which agrees with the experimental value. , it is clear that i.e., the The speed of sound is different in differentmedia. speed of sound is inversely proportional to the The speed of sound is more in solids, less in square root of density of the gas. The density of liquids and least in gases ( since solids are much oxygen is 16 times the density of hydrogen, more elastic than the liquids and gases). therefore the speed of sound in hydrogen is four The speed of sound is nearly in steel, times the speed of sound in oxygen*. in water and in air at . (ii) Effect of temperature : The speed of Table below gives the speed of sound in sound in a gas increases with the increase in Tifferent media at . themperature of the gas. The reason is that with the increase in temperature, the density of gas decreases and consequently the speed of sound proportional to the square root of temperature of the medium i.e., where is the temperature of the gas on the Kelvin scale. Examples showing that the speed of sound in steel is more than that in air The speed of sound in air increases by about (or per second) for each degree celsius rise in temperature (provided that the rise in temperature is not very large). i.e., (1) If sound is produced at one end of a Example : The speed of sound in the dry still air at is . At , the speed of sound in this air will be very long steel bar, two sounds are heard at the in air increases with the increase in humidity in through steel and the other which is heard later, the density of dry air at ordinary temperature, mmic is through air. (2) A person living near the railway track decrease the density of air. Hence the speed of often presses his ear against the steel rail to sound in the humid air is greater than the speed guess whether a train is coming or not. The of sound in dry air. In other words, the sound reason is that the vibrations produced by the travelsfaster in humid air than in dry air. moving wheels of train, travel much faster (iv) Effect of direction of wind : The speed through the steel rail than through air. So sound of sound increases or decreases according to the is heard through track much before it is heard direction of travel of wind. If wind is blowing through air. Thus the person by hearing sound in the direction of propagation of sound, the through the steel rail gets an indication of speed of sound increases, while if it is blowing coming of train well before its sound is heard.. 8. FACTORS AFFECTING THE SPEED OF SOUND IN A GAS The speed of sound in a gas is affected by the change in (i) density, (ii) temperature,
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Question Text
How there is phase difference in interference of light...?
Updated OnFeb 9, 2023
TopicWaves and SHM
SubjectPhysics
ClassClass 12
Answer Type Video solution: 1
Upvotes90
Avg. Video Duration8 min