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
Ne4ueva [31]
3 years ago
12

Doppler shifted hydrogen absorption lines are seen in the spectrum of a star.

Physics
1 answer:
IceJOKER [234]3 years ago
6 0

Answer:

Explanation:

It is given that,

Wavelength of hydrogen line, \lambda=656.28\ nm=656.28\times 10^{-9}\ m

Shift in wavelength, \lambda'=656.08\ nm=656.08\times 10^{-9}\ m

According to Relativistic Doppler Effect, the shift in wavelength is given by :

\dfrac{\lambda'}{\lambda}=\sqrt{\dfrac{1+v/c}{1-v/c}}

v is the speed of star

c is the speed of light

(\dfrac{\lambda'}{\lambda})^2=\dfrac{c+v}{c-v}

v=c-\dfrac{2c}{(\dfrac{\lambda'}{\lambda})^2+1}

v=3\times 10^8-\dfrac{2\times 3\times 10^8}{(\dfrac{656.08\times 10^{-9}}{656.28\times 10^{-9}})^2+1}

v=91438.32\ m/s

or

v = 91.43 km/s

So, the star is moving with a speed of about 100 km/s. Hence, this is the required solution.

You might be interested in
A motorbike is traveling to the left with a speed of 27.0\,\dfrac{\text m}{\text s}27.0 s m ​ 27, point, 0, start fraction, star
myrzilka [38]

Answer:

\frac{729\frac{m^{2} }{s^{2} } }{83m}≈8.8\frac{m}{s^{2} }

Explanation:

7 0
3 years ago
Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 21.0 kg and box B has mass 8.0 kg. A horizont
vfiekz [6]

Answer:

2.75 N

Explanation:

Given that,

Box A has a mass 21.0 kg and box B has a mass 8.0 kg.

A horizontal force of 100N is exerted on box A.

Let a be the acceleration of the system. Using second law of motion,

F=(m_A+m_B)a\\\\a=\dfrac{F}{(m_A+m_B)}\\\\a=\dfrac{10}{(21+8)}\\\\a=0.344\ m/s^2

Now applying Newton's second law to box B. So,

F_A=m_Ba\\\\=8\times 0.344\\\\=2.75\ N

So, 2.75 N is the force that box A exerts on box B.

8 0
3 years ago
How does the image make the message in the "Mummy, what happens to us if the bomb drops?" poster more clear?
Nimfa-mama [501]

Answer:

C. The poster provides an emotional picture of a young, innocent girl with a slightly worried expression to make protective feelings.

Explanation:

The girl looks quite worried in the poster. Attached is the image:

8 0
2 years ago
Continuing from the other question
Vilka [71]

Answer:

iv)Salt

III) Ethanol

Hopefully this helps you all the best.Help me out by giving me a like

8 0
2 years ago
While carrying a heavy box up the stairs,you set the box on a step and rest. Then you pick up the box and carry it to the top of
slega [8]

Answer: When the box is on a step and in a resting position then in this situation, the forces acting on the box is said to be balanced forces. While carrying the box to the top of the stair then the forces acting on it will be unbalanced forces.

Explanation:

When the box is on a step and in a resting position then the forces acting on the box are acting in an equal in magnitude and opposite in direction. Therefore, these forces are balanced forces.

While carrying the box to the top of the stair then the forces acting on it will be unbalanced forces because the box is changing its state. There is an unbalanced force which opposes the motion of the box.

6 0
4 years ago
Other questions:
  • Is there a difference between potential difference, voltage and EMF?
    12·1 answer
  • If a pulley system with an actual mechanical advantage of 2,000,000 is used in lifting a 2,000 lb. car, what effort would be nee
    5·2 answers
  • Comic strip hero superman meets an asteroid in outer space and hurls it at 100m/s. he has a mass of "m". The astroid has a mass
    11·1 answer
  • A weightlifter is holding a 200-kg barbell at a height of 1 meter
    7·2 answers
  • The periodic table organizes elements according to INCREASING A) atomic mass. B) energy level. C) atomic number. D) valence numb
    6·1 answer
  • Match the word to it's definition.
    11·1 answer
  • What happens when q wave is reflected from the surface of a boundary brainly​
    14·1 answer
  • The metric unit of force is the <br> A. kilogram. <br> B. gram. <br> C. newton. <br> D. nanometer.
    8·2 answers
  • How is the density of a material determined?
    9·1 answer
  • During the time that the blocks are in contact, describe whether the center of mass of the two-block system is speeding up, slow
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!