What wavelength is the signal detected on the home planet

Reference no: EM13680792

A star ship approaches its home planet at a speed of 0.1c. When it is 5.4×10⁷km away, it uses its green laser beam (=540nm) to signal its approach.

Part A

How long does the signal take to travel to the home planet?

Part B

At what wavelength is the signal detected on the home planet?

Reference no: EM13680792

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