15 - Interference _ Diffraction

15 - Interference _ Diffraction - Physics 8B 15...

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Physics 8B 15 – Interference & Diffraction rev 4.0 1 1. Consider two radio towers separated by 300m. They broadcast identical signals of wavelength ! = 200 m (AM radio 1500 kHz). A is located 10 km east from the midpoint of the towers as shown. B is located 600 m north of tower 1. C is located 700 m north of tower 1. a) Do the two signals interfere completely constructively, completely destructively, or somewhere in between at A? b) Do the two signals interfere completely constructively, completely destructively, or somewhere in between at B? c) Do the two signals interfere completely constructively, completely destructively, or somewhere in between at C? d) For what angle (or angles) will the two signals interfere destructively at D? 2. Red light of wavelength 650nm falls on two narrow vertical slits whose separation is 1.3 ! 10 -4 m. An interference pattern is formed on a screen 1.6m away. a) Describe the pattern seen on the screen. b) What are the locations of the dark bands on the screen? c)
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15 - Interference _ Diffraction - Physics 8B 15...

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