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Hello everyone, this is problem 10 from chapter 28.
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It says that radio waves of a given frequency arrive at two telescopes that are connected by a computer to perform interferometry.
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One portion of the same wavefront travels a given distance farther than the other before the two signals are combined.
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It says, part a says, will the two waves combine constructively or destructively? all right, so in order to figure out whether the wave will interfere, constructively or destructively, we need to look at the value of delta l over lambda.
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And if this is an integer, then we know that they'll interfere constructively.
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And if it's a half integer, they'll interfere destructively.
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And if it's something in between those, it won't be totally constructive or totally destructive.
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Okay.
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So we are given, we are not given lambda.
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We are given delta l...