Strategy: Find (\gamma \approx 7.09). Lifetime in Earth frame = (2.2 \times 7.09 \approx 15.6 , \mu s). Distance = (0.99c \times 15.6 \times 10^-6 \approx 4.6 , km). A light signal emitted at 500 nm from a white dwarf (mass (1 M_\odot), radius (10^4 km)) is received on Earth. Find the received wavelength.
It seems you’re referencing by Cristhian Daniel (possibly a student, educator, or independent author). Since I don’t have access to that specific book or unpublished text, I will provide a universal study guide to Einstein’s Theory of Relativity, structured as if it complemented a textbook by that author.
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