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
Scilla [17]
3 years ago
10

An astronomer would most likely use the doppler effect to question 12 options: 1) measure the color of a star. 2) measure the pa

rallax of a star. 3) measure the brightness of a star. 4) measure the shift in the emission spectrum of a star.
Physics
2 answers:
nignag [31]3 years ago
8 0

Answer:

4) measure the shift in the emission spectrum of a star.

Explanation:

Doppler effect occurs when a source emitting waves is moving relative to an observer (or when the observer is moving relative to the source). When this occurs, the frequency (and the wavelength) of the waves emitted by the source appears shifted to the observer.

In astronomy, this effect occurs with stars and galaxies. In fact, stars (and galaxies as well) move relative to us. Since stars are source of visible light (which is a form of electromagnetic radiation, so it is a form of wave), the frequency and the wavelength of the light we observe from a star is shifted. In particular, two situations are possible:

- When a star is moving away from us, its wavelength appears to be increased compared to the original wavelength: therefore, the spectrum of visible light shifts towards the red (which is the color with longer wavelength), and this is called red-shift

- When a star is moving towards us, its wavelength appears to be decreased compared to its original wavelength: therefore, the spectrum of visible light shifts towards the blue (shorter wavelength), and this is called blue-shift

zalisa [80]3 years ago
6 0

The answer would be number four. I'm sorry if I am too late. Byes.....

You might be interested in
A standard 1 kilogram weight is a cylinder 41.5 mm in height and 44.0 mm in diameter. what is the density of the material?
Korvikt [17]

Answer;

=15855.40 kg/m^3

Explanation;

Volume (V) of the cylinder = pi x r^2 x h  

V = 3.14 x (44/2 x 10^-3)^2 x 41.5 x 10^-3  

V = 6.307 x 10^-5 m^3  

By density = m/V  

mass = 1 kg

density = 1/(6.307 x 10^-5) = 15855.40 kg/m^3

6 0
3 years ago
A monochromatic light beam is incident on a barium target that has a work function of 2.50 \mathrm{eV} . If a potential differen
leva [86]

The wavelength of the light beam required to turn back all the ejected electrons is 497 nm which is option (b).

  • Work function is a material property defined as the minimum amount of energy  required to infinitely remove electrons from the surface of a particular solid.
  • The potential difference required to support all emitted electrons is called the stopping potential which is given by v_0=\frac{K.E_m_a_x}{e} .....(1)
  • where v_0 is the stopping potential and e is the charge of the electron given by 1.6\times10^-^1^9 .

It is given that work function (Ф) of monochromatic light is 2.50 eV.

Einstein photoelectric equation  is given by:

K.E_m_a_x=E-\phi      ....(2)

where K.E(max) is the maximum kinetic energy.

Substituting (1) into (2) , we get

  ev_0=E-\phi\\1.6\times10^{-19} \times1=E-2.50\\E=1.6\times10^{-19}+2.50\\E=2.50eV

As we know that E=\frac{hc}{\lambda}  ....(3)

where Speed of light,c = 3\times10^8 m/s and Planck's constant , h = 6.63\times 10^-^1^9Js = 4.14\times 10^-^1^5 eVs

From equation (3) , we get

\lambda=\frac{hc}{E} \\\\\lambda=\frac{  4.14\times 10^-^1^5 \times 3 \times10^8}{2.50} \\\\\lambda=\frac{1240\times10^-^9}{2.50} \\\\\lambda=496.8\times10^-^9\\\\\lambda=497nm

Learn about more einstein photoelectric equation  here:

brainly.com/question/11683155

#SPJ4

8 0
1 year ago
If a runner does 1,500 J of work over 10.0 s, then how much power does she have?
erma4kov [3.2K]
I would say 150 joules, i don't know if its right though check
8 0
3 years ago
Read 2 more answers
Match the following properties to the type of wave.
Reil [10]

Answer:

hi there

Explanation:

1 - III

2- 1

3-1

HOPE IT HELP YOU

PLz mark me as a BRAINLIST

6 0
2 years ago
Read 2 more answers
Which of the following does NOT support the geologic evidence used to date the earth?
Zanzabum

Answer:

comparing the anatomy of organisms

Explanation:

Basically, Rocks are the solid evidence used to date the earth.

Due to the changing in the genetic make up of organisms,the anatomy of organisms is not a reliable evidence to date the earth.

4 0
2 years ago
Other questions:
  • What is the weight of a 42 kg object if the object was on the moon?
    7·1 answer
  • Why does the frequency of a wave increase as the wavelength decreases?
    7·2 answers
  • What type of friction prevents a pile of rocks from falling apart?
    13·1 answer
  • Use Kepler’s laws and the period of the Moon (27.4 d) to determine the period of an artificial satellite orbiting very near the
    5·2 answers
  • Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined plane and allowed t
    7·1 answer
  • Se desea cortar una tela en pedazos rectangulares cuya área sea igual a 72 cm2 a. Elaborar la tabla que muestra los posibles val
    13·1 answer
  • Factor that changes because of the manipulated variable
    13·1 answer
  • The _________ is the difference between two times
    13·1 answer
  • The chart shows data for a moving object.
    6·1 answer
  • A child has fallen while riding a bike. When should a bystander call 911 ?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!