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Does the velocity of a star toward or away from earth determine measuring the shift of its spectral lines?
Wiki User
∙ 12y ago
Yes. If the star is moving away from the Earth, its spectral lines will shift towards the red end of the spectrum. If it is moving towards the Earth, its spectral lines will shift towards the violet end of the spectrum. This is due to Doppler effect.
Wiki User
∙ 12y ago
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What direction does the angular velocity vector of the Earth's rotation point toward?
The Earth's angular velocity vector due to its axial rotation points towards the north pole.
Does Objects that are falling toward Earth move faster and faster?
Until the object reaches it terminal velocity
How do light waves appear to an observer as the light source moves towards the observer?
If we measure the spectrum of the light, we can determine whether the light is moving toward us or away from us. Sunlight looks white, but is actually made up of thousands of individual colors, and the amount of each color depends on what the star is made of. In the far future, spacemen will be able to detect which star is which, by measuring the spectrum of the light. By measuring the pattern of the spectrum, and the exact frequency of the light waves, we can determine whether the light source is moving toward us or away from us. (Actually, that isn't exactly true; we couldn't tell if it was moving toward us, or WE were moving toward IT. But we will know what we're getting closer together.) There is one other "Gotcha!" about this. If the spectrum indicates that the light source is moving away from us, it is possible that the light source is very near a black hole. Gravity affects light just like it affects mass, and sometimes it is difficult to tell whether the light source is moving away, or if gravity is pulling the light away. Usually, we will be able to determine which is happening from other measurements.
Using the Doppler effect astronomers can determine a stars what?
How close and far something is from you.
When a star or galaxy moves quickly away it is called what?
We can measure fairly accurately the radial speed of a star or galaxy by measuring the Doppler shift of the emitted light from the star. Stars emit specific frequencies of light, and we can measure the frequencies to determine what elements are contained within the star. But since we know exactly what the frequencies are, we can measure the precise frequencies that we measure from the star. A star moving toward us will have its light "blue-shifted", or compressed a tiny bit in frequency. The amount of the compression tells us the radial velocity. A star whose light is red-shifted is moving away from us. Radial velocity is the part of the velocity that is directly toward or away from us; Doppler shifts don't tell us anything about a star's side-to-side motion. One of the astonishing discoveries of Edwin Hubble is that most galaxies are moving away from us, and the farther away they are, the faster they seem to be receding. Some nearby galaxies are moving closer, but the more distant the galaxy, the faster it is moving moving away. He determined this by the "red shift" of the light from distant galaxies.
What can astronomers learn about the stars motion based on wavelength shifts?
They can determine how fast the star is moving toward or away from us. The chemical spectral signature is used to determine the Doppler shift of the visible light reaching us. This is then used to calculate how fast we and the star in question are moving toward or away from each other.
Observation of the shift of a stars spectrum toward the red or blue enables us to determine the stars?
The star's velocity (away from us, or towards us).
Why would the star Sirius find that its spectral lines are blue shifted?
The spectral lines of Sirius are blueshifted because the star is moving more or less toward us.
The apparent shift in the spectrum of a star as it moves toward or away from the earth is explained by the phenomenon known as the?
Doppler effect. This effect causes the wavelengths of light from a star to appear shorter (blueshifted) as it moves towards the Earth and longer (redshifted) as it moves away, providing valuable information about the star's motion in space.
When will an object falling toward earth accelerating?
at terminal velocity
When a light wave bends toward the normal what does that tell you about the velocity?
It decreases.
Eighty miles per hour toward the northeast is an example of.?
A velocity vector.
When will an object stop falling toward earth stop accelerating?
at terminal velocity
When gravitational forces and air resistance equalize on an object that is falling toward earth and the objects stop accelerating its velocity is called the?
terminal velocity
What can velocity be compared with?
'Velocity' should be compared with 'speed', and it should be understood that they're different. "30 miles per hour" is a speed. "30 miles per hour toward the south" is a velocity.
A wave is moving toward shore with a velocity of 50.0 if its frequency is 2.5 hertz what is its wavelength?
50 / 2.5 = 20, same units as numerator of velocity
When gravitational forces and air resistance equalize on an object that is falling toward earth and the object stops accelerating its velocity is called?
In that case, the object is said to have achieved terminal speed.
