A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 726
s arise. In the second case (Fig. 6-13 (b))there is n»> focus, as the waves diverge more after passing throughthe lens than before falling upon it. Effect of wind upon sound waves.—When the wind is blowing fromtli sounding body inwards the observer, the sound is more clearlyheard than if there… … ne direction than another; the velocity of sound would, of course,>e changed, but not its intensity. However, the velocity of thevind is not everywhere the same ; it is least near the ground andncreases with increasing altitude. Consider plane compressionvaves abc, etc.-(Fig. 644 (a)). Thevind…
Physics
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