A source of radiation is moving away from you at 10% of the speed of light. At what wavelength is the Hα line seen?

A source of radiation is moving away from you at 10% of the speed of light....
A spaceship is moving away from Earth at speed 0.20c. A source on the rear of the ship emits light at wavelength 450 nm according to someone on the ship. What is the wavelength of the light observed by someone on the Earth?
A distant galaxy is moving away from Earth at a speed of 70,000 km/s. If a star in that galaxy emits light at a wavelength of 450 nm, what is the wavelength of that light when it reaches Earth? Speed of light c= 300,000 km/s.
A galaxy is moving away from us at 2.5 *10^7m/s. What is the frequency of light observed by us if the wavelength of the emitted light is 500 nm?
05. Light from a spaceship is observed, then the spaceship moves directly away from the observer at high speed while still emitting the light. As a result, the light seen by the observer has: A. a higher frequency and a longer wavelength than before B. a lower frequency and a shorter wavelength than before C. a higher frequency and a shorter wavelength than before D. a lower frequency and a longer wavelength than before E. the same frequency and wavelength...
A light source on the ground is positioned 10 meters away from a wall. A walker who is 2 meters long begins his race towards the wall from the light source at the speed of 1 m / s. How quickly does the length of its shadow change when the walker is 4 meters from the source?
Electromagnetic radiation from a star is observed with an earth-based telescope. The star is moving away from the earth with a speed of 0.570c. If the radiation has a frequency of 8.64×1014Hz in the rest frame of the star, what is the frequency measured by an observer on earth? Express your answer with the appropriate units.
Consider a spiral galaxy that is moving directly away from Earth with a speed V=3.24*10^5 at its center. The galaxy is also rotating about its center such that points in the spiral arms are moving with a soeed V=5.750*10^5m/s relative to the center. If light with a frequency of 7.308*10^14Hz is emitted in both arms of the galaxy, what frequency is detected by astronomers observing the arm that is moving (a) toward and (b) away from Earth? Please break down...
Bob is moving away from Alice with speed of 0.5c. Carlos is moving away from Alice and perpendicular to Bob with speed of 0.8 c. What is the speed of Carlos as measured by Alice?
Light radiates from a distant star that is moving towards Earth. In the Earth's frame of reference the light has a wavelength of 400 nm. If the star is moving with a speed of 0.41 c, what wavelength, in nm, will be seen by an observer in the star's frame. Calculated your answer to two decimal places.
Stars and other galactic objects may be moving towards or away from us at very high speeds. This leads to a doppler shift of the electromagnetic radiation observed from this object. In each of the following cases, you are given the type of emitted radiation (as if you were at rest relative to the object) and the type of radiation towards which the observed light is shifted. From this information determine whether the object is traveling towards or away from...