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The radio waves of Exercise 20 in Chapter 2 have wavelength 0.1m. If we want to send this signal in a well-defined beam from the

The radio waves of Exercise 20 in Chapter 2 have wavelength 0.1m. If we want to send this signal in a well-defined beam from the spacecraft toward Earth, not wasting energy by allowign it to spread in all directions, roughly how large a transmitting antenna must the spacecraft carry? Explain your reasoning

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