A Spaceship Is Traveling at a Speed of 15,000 Km/s

question 23

Multiple Choice

A spaceship is traveling at a speed of 15,000 km/s from planet "B" toward planet "A." The spaceship sends out a signal with a wavelength of 4 m.If astronomers living on planets A and B measure the radio waves coming from the spaceship, what wavelengths will they measure?

• A) Planet A measures 6 m, and planet B measures 2 m.
• B) Planet A measures 2 m, and planet B measures 6 m.
• C) Planet A measures 4.2 m, and planet B measures 3.8 m.
• D) Planet A measures 3.8 m, and planet B measures 4.2 m.
• E) Both Planet A and planet B measure 4 m.