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
svlad2 [7]
3 years ago
9

A spectral line from a star is observed to have a wavelength of 656.5 nm. The rest wavelength of this line is 656.8 nm. (a) What

is the speed of the star, and (b) is it approaching or receding from the Earth? (c) If the star’s emitted wavelength is the same as the rest value, what is happening?
Physics
1 answer:
nignag [31]3 years ago
6 0

Answer:

speed of star is  1.37 × 10^{5} m/s

it is approaching to earth because wavelength of star is decreasing than rest

if emit same wavelength it does not move anywhere

it will remain steady condition with respect earth

Explanation:

given data

wavelength = 656.5 nm

rest wavelength = 656.8 nm

to find out

the speed of the star , is it approaching

solution

we know here equation that is

wavelength shift / wavelength at rest  = velocity of source / speed of light

so put all value and find

velocity of source = 3 × 10^{-9} × 3 × 10^{8} / 656.8 × 10^{-9}

velocity of source star = 1.37 × 10^{5} m/s

and

it is approaching to earth because wavelength of star is decreasing than rest

and

if emit same wavelength it does not move anywhere

it will remain steady condition with respect earth

You might be interested in
Alice drops a rock to a well. She hears the splash of the rock 4.1s later. The speed of sound is 340m/s. How deep is the well
Maksim231197 [3]

Answer:

697 m

Explanation:

From the question above,

Note: Alice hears the splash of the rock in the well through the help of echo.

Applying,

v = 2x/t........................ Equation 1

Where v = speed of sound, x = depth of the well, t = time.

make x the subject of the formula in equation 1

x = vt/2................... Equation 2.

Given: v = 340 m/s, t = 4.1 s

Substitute these values into equation 2

x = 340(4.1)/2

x = 697 m.

3 0
3 years ago
Two infinite wires 20 cm apart each carry a current of 3 A into the paper. d I I d/2 d/2 At a distance d 2 below their midpoint,
Rzqust [24]

<u>Answer:</u>

<h3>As electric current is carried in a cable, around it, a magnetic field is created. The lines of the magnetic fields form concentric circles around the wire. The direction of the magnetic field hinges on the direction of the current. It can be calculated by pointing the thumb of your right hand in the direction of the moment, using the "right hand law." The position of your curled fingers is in the magnetic field lines. The magnetic field magnitude depends on the sum of current, and the distance from the wire carrying the charge.</h3>

<u></u>

<u>Explanation:</u>

Determine the direction of vector B magnitude B: B: B=\mu_{0} * 1 /(2 \pi r): r=d / 2 * \sqrt{2}

\cos \alpha=1 / 2 \Rightarrow \alpha=450

Resultant magnitude strength: B=2 B^{*} \cos \alpha=B=u_{0}^{*} 1 /(2 \pi r)=4.24^{*} 10^{-6} T=4.24 u T its direction is pointing to the left.

Note: Refer the image attached below

3 0
3 years ago
Energy in an ecosystem is first obtained by
Likurg_2 [28]

Answer:

The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water. This establishes the beginning of energy flow through almost all food webs.

You're welcome if I helped!

6 0
2 years ago
A ball is thrown upward. what can be said about the system ?
Liula [17]
That you have thrown a ball with kinetic energy upwards at an increasing velocity rate
4 0
2 years ago
Read 2 more answers
- Name two elements that have the SAME (rounded) atomic mass:
katovenus [111]

Answer:

Magnesium atomic no. = 24,25,26. These are the two elements which have same atomic no

Explanation:

3 0
2 years ago
Other questions:
  • Which of the following is one way that technology can improve procut<br> ?
    13·1 answer
  • Refer to the following diagram to answer this question
    9·2 answers
  • Define a motion diagram?
    12·1 answer
  • The engine in an imaginary sports car can provide constant power to the wheels over a range of speeds from 0 to 70 miles per hou
    6·1 answer
  • If you were told an atom was an ion, you would know the atom must have a...
    13·1 answer
  • A temperature of 20°C is equivalent to approximately
    9·2 answers
  • A freight train is accelerating on a level track. The tension in the coupling between the engine and the first freight car would
    14·1 answer
  • Which symbol and unit of measurement are used for electric current? symbol: A; unit: I symbol: C; unit: A symbol: I; unit: C sym
    6·2 answers
  • In what section of the EM spectrum can we find visible light?
    12·1 answer
  • I want to know what is the pressure of the stratosphere simple numbers <br> I’m in 6 grade
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!