General Relativity: An Introduction for Physicists · Problem 1.11

The spacetime of special relativity — Hobson, Efstathiou & Lasenby

Physics · doppler-effect-application

Problem

Astronauts in a spaceship travelling in a straight line past the Earth at speed

v = c/2

wish to tune into Radio 4 on 198 kHz. To what frequency should they tune at the instant when the ship is closest to Earth?