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3. When Mars is closest to the Earth it is still 7.8 x 107 km away. How long does it take a radio signal to

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3. When Mars is closest to the Earth it is still 7.8 x 107 km away. How long does it take a radio signal to get to Mars when it is this close? With this in mind, would a Mars rover remotely controlled from Earth be practical? 4. a. What is the frequency of red light with wavelength 650 nm? b. What is the wavelength of a y ray with frequency 1020 Hz

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