# ch16 - CHAPTER 16 Superposition and Standing Waves 1 True...

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CHAPTER 16 Superposition and Standing Waves 1* · True or false: ( a ) The waves from two coherent sources that are radiating in phase interfere constructively everywhere in space. ( b ) Two wave sources that are out of phase by 180 o are incoherent. ( c ) Interference patterns are observed only for coherent sources. ( a ) False ( b ) False ( c ) True 2 · Two violinists standing a few feet apart are playing the same notes. Are there places in the room where certain notes are not heard because of destructive interference? Explain. No; the two sources are incoherent and do not give rise to interference. 3 ·· Two rectangular wave pulses are traveling in opposite directions along a string. At t = 0, the two pulses are as shown in Figure 16-27. Sketch the wave functions for t = 1, 2, and 3 s .

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