What are the speed of recession, in kilometers per second, and redshift of a galaxy that...

What are the speed of recession, in kilometers per second, and redshift of a galaxy that is a distance of 183 megaparsecs (Mpc) away? Speed of recession? Redshift?

Solutions

Expert Solution

By Hubble's law, the speed of recession of a galaxy relative to an observer is proportional to its distance from the observer.

The proportionality constant is the Hubble's constant with value , which says that if a galaxy is a one megaparsec away, its speed of recession will be .

Since the galaxy in the question is at a distance of , its recession speed

Thus the speed of the galaxy .

Since the galaxy is moving away from us, the light (or radiation, in general) will be redshifted.

If is the frequency of radiation emitted by the galaxy and is the observed frequency of radiation from the galaxy, then the relativistic Doppler shift formula gives:

where is the speed of the galaxy. Plugging in the values in metre per second gives the following.

Redshift is defined as

Thus the redshift of the galaxy is %.

genius_generous answered 1 year ago

Next > < Previous

Related Solutions

Your car travels west at an average speed of x kilometers per hour and your friend’s...

Your car travels west at an average speed of x kilometers per hour and your friend’s car travels south at an average speed of Y Kilometers per hour. Write a C++ code that prompts the user to enter the average speed of your car and your friend’s car and the elapsed time in hours and minutes since the 2 cars started their movement, and output the shortest distance between the 2 cars.

What is the speed in meters per second of a baseball traveling at 89 mph given...

What is the speed in meters per second of a baseball traveling at 89 mph given that 1 mph = 0.447 m/s?

A rubber bullet is shot with a speed of 130 meters per second with an angle...

A rubber bullet is shot with a speed of 130 meters per second with an angle 67.4 degrees above the horizontal. The ground is 115 meters above from where the rubber bullet was shot. 1. How much time is the bullet in flight? 2. How much time will it take for the bullet to reach max height? 3. How much is the max altitude the bullet can reach> 4. What time is the bullet 425 meters from the ground? 5....

A ten grams ball glides to the left at a speed of 0.4 meters per second...

A ten grams ball glides to the left at a speed of 0.4 meters per second on a frictionless flat surface at the OC fair skating rink. The ball collides head-on, elastically, with another larger ball with mass 30 grams which was gliding to the right with a speed of 0.2 meters per second. A. After the collision, what is the final velocity of each ball. B. What is the change in momentum for each ball? How do they compare...

A baseball pitcher throws a baseball with an initial speed of 91 feet per second at...

A baseball pitcher throws a baseball with an initial speed of 91 feet per second at an angle of 5 degree to the horizontal. The ball leaves the pitcher's hand at a height of 15 feet. Write the parametric equations that describe the motion of the ball as a function of time. a) Write a set of parametric equations that model the baseball. b) What is the max height of the ball? c) When does the ball hit the ground?...

There is well known gravitational redshift of real photons. What about gravitational redshift of virtual photons...

There is well known gravitational redshift of real photons. What about gravitational redshift of virtual photons of charged neutron star? Is electrostatic force become weaker while mass of charged neutron star is growing? How can electrostatic field of a charged particle swallowed by a black hole escape from the event horizon? How can charged black holes exist at all?

A1) Question: If the economy is in a recession, what types of fiscal policy can speed...

A1) Question: If the economy is in a recession, what types of fiscal policy can speed up the recovery? A2) Question: How might a local craft market such as a farmer's market or a fruit stand generate a larger effect on output in the city than a large retailer?

Bob throws a ball straight up with an initial speed of 46 feet per second from...

Bob throws a ball straight up with an initial speed of 46 feet per second from a height of 77 feet. (a) Find parametric equations that describe the motion of the ball as a function of time. (b) How long is the ball in the air? (c) When is the ball at its maximum height? Determine the maximum height of the ball. (d) Simulate the motion of the ball by graphing the equations found in part (a). Assume Bob stands...

A2-kg object is falling downward with its speed increasing at a rate of 8m/s per second....

A2-kg object is falling downward with its speed increasing at a rate of 8m/s per second. We conjecture that there must be some other force acting on the object in addition to the downward pull of gravity. What can we say about this other force? A. It has a magnitude of 2 N and points in the downward direction. B. It has a magnitude of 16 N and points in the upward direction. C. It has a magnitude of 36...

The second half of the 1940s was a period of A. recession. B. no economic growth....

The second half of the 1940s was a period of A. recession. B. no economic growth. C. very slow economic growth. D. fairly high economic growth.

Subjects