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
neonofarm [45]
2 years ago
13

Astronomers observe a spectral analysis of a distant star where a particular element has a spectral line with a wavelength of 66

3 nm. In the laboratory, the same element has a spectral line with a wavelength of 645 nm.
a. How fast is the star moving, and in what direction is it moving?

b. The same element on Earth’s surface is observed from a space shuttle orbiting at 7800 m/s,
350 km above Earth. Is the same shift in the spectral line seen from the space shuttle? Why or why not?
Physics
1 answer:
tekilochka [14]2 years ago
7 0

Answer:

(a). The velocity of star is 8.1\times10^{6}\ m/s and the direction of star toward the earth.

(b). The shift is 0.0168 nm.

Explanation:

Given that,

Wavelength of spectral line = 663 nm

Wavelength of spectral line in lab = 645 nm

(a). We need to calculate the velocity

Using doppler's effect

\Delta \lambda=\dfrac{v}{c}\lambda

Where, \Delta\lambda= change in wavelength

v = velocity

c = speed of light

Put the value into the formula

663-645=\dfrac{v}{3\times10^{8}}\times663

v=\dfrac{3\times10^{8}(663-645)}{663}

v=8144796.38\ m/s

v=8.1\times10^{6}\ m/s

The direction of star toward the earth.

(b). Speed = 7800 m/s

We need to calculate the shift

Using formula of shift

\Delta \lambda=\lambda(\sqrt{\dfrac{1+\dfrac{v}{c}}{1-\dfrac{v}{c}}}-1)

Put the value into the formula

\Delta \lambda=645\times(\sqrt{\dfrac{1+\dfrac{7800}{3\times10^{8}}}{1-\dfrac{7800}{3\times10^{8}}}}-1)

\Delta\lambda=0.0168\ nm

This shift is small compare to the the movement of Earth around the sun.

Hence, (a). The velocity of star is 8.1\times10^{6}\ m/s and the direction of star toward the earth.

(b). The shift is 0.0168 nm.

You might be interested in
You can see lightning before you can hear the thunder. Which is the best explanation for this?
liubo4ka [24]
Salutations!

<span>You can see lightning before you can hear the thunder. Which is the best explanation for this?

The best explanation for this statement is the transmission of light in air is faster than the transmission of sound in the air. Light is faster than sound, thus you can see the thunder then you can hear the sound.

Hope I helped :D</span>
8 0
2 years ago
Read 2 more answers
What kind of reaction typically has a carbon compound and oxygen as
Anna11 [10]

Answer:

Answer would be  C because combustion does the process of heat. Oxygen is a reactant in a combination reaction, which always produces energy in the form of heat and light. Carbon burns in the presence of oxygen to give carbon dioxide.

3 0
2 years ago
A swimmer is capable of swimming at 1.4m/s in still water. a. How far downstream will he land if he swims directly across a 180m
ozzi

Answer:

t = 180 / 1.4 = 129 sec   (time to swim horizontally across river)

S = 129 sec * V     where V is speed of current and S is the distance he will be carried downstream

The problem does not specify V the speed of the river

8 0
2 years ago
Read 2 more answers
Please answer me my question​
Angelina_Jolie [31]
3 - b) weight decreases
4 -a) 50 kg as mass is same everywhere
5 - b) 200 dynes
5 0
2 years ago
What is the significance of the nose end marking on a rocket or missile?
Gemiola [76]
If you're referring to the different colors that usually occur at the tip of missles, rockets and some other aircraft, it either a) signifies the end of a particular plate of metal, fabricated specifically to be for the nose. Sometimes these can even be a different alloy or metal all together. or b) this shows where the curved surface begins, so in the case of damage or imperfections due to wear, they can be repaired and measured more easily. The shape of the nose is extremely important for smooth flight, and a dent or bump formed on it can make the aircraft unstable. If you can measure from where the curve starts by the difference in color, it makes repairing or re-fabricating the part much easier. Many of these curves aren't as simple as they appear.
5 0
3 years ago
Other questions:
  • A bicycle has wheels of 0.70 m diameter. The bicyclist accelerates from rest with constant acceleration to 22 km/h in 10.8 s. Wh
    5·1 answer
  • A non-conducting sphere of radius R = 3.0 cm carries a charge Q = 2.0 mC distributed uniformly throughout its volume. At what di
    8·1 answer
  • A 1530 kg car moving south at 12.1 m/s collides with a 2560 kg car moving north. The cars stick together and move as a unit afte
    5·1 answer
  • You and your dog are walking along a pond. Your dog looks into the still water and is startled to see its reflection. Which phen
    13·1 answer
  • Someone pls answer! i will give u brainliest
    10·2 answers
  • PLZ PLZ PLZ PLZ PLZ PLZ PLZ HELPPPPPPPPPPPPPPPPP
    14·2 answers
  • Find the ratio of the Coulomb electric force Fe to the gravitational force Fo between two
    10·1 answer
  • Which of the following organelles is in plant cells, but not animal cells?
    5·2 answers
  • You want to calculate the area of your dorm
    13·1 answer
  • The rotating blade of a blender turns with constant angular acceleration of 1.51 rad/s^2. How much time does it take to reach an
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!