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Suppose rocket traveler Amelia has a clock made on
Earth. Every year on her birthday she sends a light sig-
nal to brother Casper on Earth. (a) At what rate does
Casper receive the signals during Amelia's outward jour-
ney? (b) At what rate does he receive the signals during
her return journey? (c) How many of Amelia's birthday
signals does Casper receive during the journey that he
measures to last 20 years?

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