A spaceship, moving toward the Earth at a speed of 0.9c, shines a green laser at Earth. An observer on Earth would see the light arriving at a speed of
A) c but at a smaller frequency.
B) c but at a shorter wavelength.
C) 1.9c and with a shorter wavelength.
D) more than c but less than 1.9c.
E) 0.1c and with an inverted frequency.

Question

Quizplus · Accepted Answer

The Answer of A spaceship, moving toward the Earth at a speed of 0.9c, shines a green laser at Earth. An observer on Earth would see the light arriving at a speed of
A) c but at a smaller frequency.
B) c but at a shorter wavelength.
C) 1.9c and with a shorter wavelength.
D) more than c but less than 1.9c.
E) 0.1c and with an inverted frequency.

A Spaceship, Moving Toward the Earth at a Speed of 0.9c