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 735
oom, or a largedrawing board placed vertically. The sound waves from A arereflected at B, and travel backwards as though they came from A,the image of A (p. 698). If the distances AC and AC differ by a whole number of wave-lengths, the direct and reflected waves assist each other, and if 710 SOUND… … Fig. 655.—Determination of pitch by sensitive flame each other at D, and the sensitive flame will burn up brightly andsilently. A series of points of alternating quiet and disturbance canbe found in this manner. Since, AC-AC = «A, AD -AD=wA.+ ») 2i and (AD or, AC)+(AC-AD)=^,2CD4CD* Thus, the…
Physics
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