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Dvinal [7]
3 years ago
7

Light from a distant star has undergone a red shift. Which of these conclusions is correct about the star? Its pitch is increasi

ng. Its parallax is increasing. It is moving towards Earth. It is moving away from Earth.
Physics
2 answers:
Serjik [45]3 years ago
7 0

Answer:

It is moving away from Earth.

Explanation:

As the source comes closer to the observer then we can say that its frequency will increase.

So here we know that

\frac{\Delta \nu}{\nu} = \frac{v}{c}

here we know that

v = speed of the star

c = speed of light

now if we know that speed of the star is towards us then the frequency will increase and hence the wavelength will decrease.

So it is known as Blue shift

While if the star is moving away from us then in that case the frequency will decrease and hence the wavelength will increase.

So here it is known as Red Shift.

So here correct answer will be

<em>It is moving away from Earth.</em>

nignag [31]3 years ago
4 0
We've never discovered any way for wavelengths of light to
appear to get longer after they leave the source, except for
the Doppler effect ... when the observer and the source of
the light are moving apart.  

Since we don't know any other way for it to happen, whenever
we see a star or a galaxy whose light is red-shifted, we conclude
that it is moving away from Earth.

If you think about this for a few seconds, there are two things
about it that should blow your mind:

#1). "Red-shifted" means that the wavelengths of the light we see
are longer than the wavelengths of the light that left the star.
How do we know what the wavelength was when it left the star ?

#2). Our whole picture of the "expanding universe" ... which is a
big part of the foundation that supports the whole picture of the
"big bang" ... rests on the red-shift of light from distant galaxies,
and our conclusion that they are all moving away from us.
If we ever discover a DIFFERENT way that light can become
red-shifted, that may be IT for the expanding universe and the
big bang, both.  They may both be
 out the window. 
You might be interested in
#26 question
4vir4ik [10]

So, the time that taken for the astronaut to fall to the surface of the moon is <u>2.5 s.</u>

<h3>Introduction</h3>

Hi ! In this question, I will help you. In this question, you will learn about the fall time of the free fall motion. Free fall is a downward vertical motion without being preceded by an initial velocity. When moving in free fall, the time required can be calculated by the following equation:

\sf{h = \frac{1}{2} \cdot g \cdot t^2}

\sf{\frac{2 \cdot h}{g} = t^2}

\boxed{\sf{\bold{t = \sqrt{\frac{2 \cdot h}{g}}}}}

With the following condition :

  • t = interval of the time (s)
  • h = height or any other displacement at vertical line (m)
  • g = acceleration of the gravity (m/s²)

<h3>Problem Solving</h3>

We know that :

  • h = height = 5.00 m
  • g = acceleration of the gravity = 1.6 m/s²

What was asked :

  • t = interval of the time = ... s

Step by step :

\sf{t = \sqrt{\frac{2 \cdot h}{g}}}

\sf{t = \sqrt{\frac{2 \cdot 5}{1.6}}}

\sf{t = \sqrt{6.25}}

\boxed{\sf{t = 2.5 \: s}}

<h3>Conclusion</h3>

So, the time that taken for the astronaut to fall to the surface of the moon is 2.5 s.

<h3>See More</h3>
  • Time that needed for hearing the splash of fallen rock in the well brainly.com/question/26485521
  • The speed of the object at a certain height (free fall motion) brainly.com/question/26377041
  • The relationship between acceleration and the change in velocity and time in free fall brainly.com/question/26486625
3 0
3 years ago
When a car is traveling 120 km/h how many times more kinetic energy would it have than if it were
LekaFEV [45]

Answer: 9

Explanation:

Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the speed (v) by which it moves i.e K.E = 1/2 x mass x velocity^2

So, car is traveling 120 km/h

KE = 1/2x m x (120 km/h)^2

KE = 0.5 x m x 14400

KE1 = 7200m

So, car is traveling 40 km/h

KE = 1/2x m x (40 km/h)^2

KE = 0.5 x m x 1600

KE2 = 800m

Now, divide the value of kinetic energy obtained during 120 km/h by that obtained during 40 km/h

i.e 7200m / 800m

= 9

Thus, the kinetic energy will be 9 times more at a speed of 120 km/h than at 40 km/h

4 0
3 years ago
The electric potential in a volume of space is given by V(x, y, z) = 2x2 - 3y2 + 5z.
vekshin1

The electric field at (x,y,z) its equal to the negative of the gradient if the electric potential.

We have

V(x, y, z) = 2x² - 3y² + 5z

so

E(x, y, z) = -grad(V) = -(dV/dx i + dV/dy j + dV/dz k)

where d/d(variable) is meant to be a partial derivative with respect to that variable. The partial derivatives are

dV/dx = 4x

dV/dy = -6y

dV/dz = 5

and so the electric field at any point is

E(x, y, z) = -4x i + 6y j - 5k

and at (3, 4, 5) it is

E(3, 4, 5) = -12i + 24j - 5k

8 0
3 years ago
Jake is in chemistry class. He makes a list of the chemicals his instructor described and the properties of each.
koban [17]
Silver: bonds with other atoms because of the weak forces of the valence electrons 
FALSE - The strong forces of the valence electrons is actually the reason why silver bonds with other atoms.

Water: bonds allow for liquid state at room temperature and prevent conduction 
FALSE - Water is a good conductor.

Carbon: bonds with other atoms through strong shared electrical bonds 
TRUE - Carbon shares covalent bonds with other atoms.

Niobium: bonds allow for a strong conductivity found in stainless steel
FALSE - Iron and Carbon make up steel.
6 0
3 years ago
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How would the word texting be re arragned in modification
Rashid [163]
The teachers uses parts of dialogue hope it help answer what need

8 0
4 years ago
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