Final answer:
The frequency of the signal received by a spaceship moving away from Earth will be lower than the signal sent due to the Doppler Effect. The extent of the frequency shift depends on the relative speed between Earth and the spaceship.
Step-by-step explanation:
When a spaceship is moving away from Earth and sends a radio signal back, the frequency of the signal received by the spaceship will be lower than the frequency at which it was sent. This phenomenon is known as the Doppler Effect. In the given example, if a space probe is moving away from the Earth at a speed of 0.350c (where c is the speed of light) and transmits a radio signal at 1.50 GHz, the frequency received on Earth will be redshifted, indicating it will be lower than 1.50 GHz.
Example Calculation of Doppler Shift
For example, if a galaxy is moving away from Earth at a speed of 0.825c and emits radio waves with a wavelength of 0.525 m, we would detect a longer wavelength on Earth due to this same Doppler Effect.