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Exam2TutFRsol

# Exam2TutFRsol - Name Student ID Score last first V S1 S2[20...

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Name ___________________________________ Student ID _______________ Score ______ _____ last first Physics 123A, Spring 2008 Exam 2 WO-UWA123A082T-E2(2SI,MSI)sol V. [20 points total] Two sources of periodic water waves, S 1 and S 2 , produce circular waves of frequency f o in a large ripple tank, as shown. The sources are in phase and are separated by a distance equal to the wavelength of the waves (i.e., d = ± o ). Point N (not shown) is a point of complete destructive interference. Assume point N is very far away from the two sources. Ignore any dependence of the amplitude of a wave on the distance the wave travels from a source. A. Suppose the frequency of the two sources is reduced to f o /2. i. [4 pts] After the frequency is reduced, would the wavelength of the periodic waves increase, decrease, or remain the same? Explain. Since the medium (and hence v , the speed of propagation of the waves) is unchanged, the relationship v = ± f implies a decrease in frequency f will cause an increase in the wavelength ± .
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