1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
puteri [66]
3 years ago
10

How do scientists use the Doppler effect to understand the universe?

Physics
2 answers:
professor190 [17]3 years ago
6 0
There's a very subtle thing going on here, one that could blow your mind.

Wherever we look in the universe, no matter what direction we look,
we see the light from distant galaxies arriving at our telescopes with
longer wavelengths than the light SHOULD have.

The only way we know of right now that can cause light waves to get
longer after they leave the source is motion of the source away from
the observer. The lengthening of the waves on account of that motion
is called the Doppler effect.  (The answer to the question is choice-c.)

But that may not be the only way that light waves can get stretched.  It's
the only way we know of so far, and so we say that the distant galaxies
are all moving away from us. 

From that, we say the whole universe is expanding, and that right there is
one of the strongest observations that we explain with the Big Bang theory
of creation.

Now:  If ... say tomorrow ... a competent Physicist discovers another way
for light waves to get stretched after they leave the source, then the whole
"expanding universe" idea is out the window, and probably the Big Bang
theory along with it !


Now that our mind has been blown, come back down to Earth with me,
and I'll give you something else to think about:

It's true that when we look at distant galaxies, we do see their light
arriving in our telescopes with longer wavelengths than it should have.
And then we use the Doppler effect to calculate how fast that galaxy
is moving away from us.  That's all true.  Astronomers are doing it
every day.                                   I mean every night.

So here's the question for you to think about ... maybe even READ about:

When the light from a distant galaxy pours into our telescope, and we
look at it, and we measure its wavelength, and we find that the wavelength
is longer than it should be ... how do we know what it should be ? ? ?
djverab [1.8K]3 years ago
3 0

Answer: The correct option is (c).

Explanation:

In Doppler effect, there is an apparent change in the frequency when there is a relative motion between the source and the observer or the source or the listener.

When the source and the observer are approaching each other then there is increase in the frequency.

When the source and the observer are moving away from each other then there is decrease in the frequency.

Therefore, Scientists use the Doppler effect to understand the universe to determine motion of object.

You might be interested in
Three examples in which velocity is the main factor determining an object's momentum
Lorico [155]
To be honest I’m not sure you might want to ask Newton as he’s an expert best of luck
3 0
3 years ago
What is a change in the speed of an object called?
mina [271]

Acceleration........................................

5 0
3 years ago
Read 2 more answers
Consider the Bose-Einstein distribution: F60 per unit energy can be written as N aE 6.) (20pts) Assuming BE <<1,obtain an
notsponge [240]

Answer:

Explanation:

Whacbdhnd

4 0
3 years ago
Defention of reversibily
Blizzard [7]
Capable of being reversed or of reversing: as a : capable of going through a series of actions (as changes) either backward or forward 
Example : water ----> ice 
melts into water again<span />
5 0
3 years ago
A stone is thrown into a well and the splash is heard after 3s. (speed of sound : 340m/s) . 1.) What time did the stone take to
miss Akunina [59]
1.)3s
2.)6s
3.)1020m

hope this help
8 0
3 years ago
Other questions:
  • "a 2.0-m straight wire carrying a current of 0.60 a is oriented parallel to a uniform magnetic field of 0.50 t. what is the magn
    14·1 answer
  • If a marble is released from a height of 10 m how long would it take for it to hit the ground?
    11·1 answer
  • Which statement best describes air pressure at high altitudes? (Points : 3)
    10·2 answers
  • In a science museum, a 140 kg brass pendulum bob swings at the end of a 16.8 m -long wire.
    15·1 answer
  • Making payments to a victim in order to repay them for losses they incurred during or as a result of the crime is called
    15·1 answer
  • A worker pushes a large rock to the north while another worker helps by pushing it to the east. If they both exert equal force,
    12·1 answer
  • Create a file "parts_inv.dat" that stores on each line a part number, cost, and quantity in inventory, in the following format:1
    6·1 answer
  • The highly exothermic thermite reaction, in which aluminum reduces iron(iii) oxide to elemental iron, has been used by railroad
    14·1 answer
  • A train is moving at a speed of 50 km/h. How many hours will it take thetrain to travel 600 kilometers
    11·1 answer
  • Solve for the length of the inclined plane if the angle equals 19.45 degrees.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!