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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.....

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What is power in physics​
Shkiper50 [21]

Edit

In physics, power is the rate of doing work or of transferring heat, i.e. the amount of energy transferred or converted per unit time. Having no direction, it is a scalarquantity. In the International System of Units, the unit of power is the joule per second (J/s), known as the watt in honour of James Watt, the eighteenth-century developer of the condenser steam engine. Another common and traditional measure is horsepower (comparing to the power of a horse). Being the rate of work, the equation for power can be written:

Power

Common symbols

Derivations from

other quantities

P = E/t

P = F·v

P = V·I

P = T·ω

As a physical concept, power requires both a change in the physical system and a specified time in which the change occurs. This is distinct from the concept of work, which is only measured in terms of a net change in the state of the physical system. The same amount of work is done when carrying a load up a flight of stairs whether the person carrying it walks or runs, but more power is needed for running because the work is done in a shorter amount of time.

8 0
3 years ago
Com que rapidez estará sendo feito trabalho elétrico num resistor de 10 ohms, percorrido por uma corrente elétrica de 5 A? Qual
34kurt

Poder = (resistencia) x (corrente)²

Poder = (10 ohms) x (5 A)²

<em>Poder = 250 watts </em>(250 Joule por segundo)

2 horas = 7,200 segundos

Energia = (250 joule/seg) x (7,200 seg)

<em>Energia = 1,800,000 Joules</em>

7 0
3 years ago
Cooling systems, such as air conditioners and refrigerators, transfer thermal energy in order to keep homes and cars cool or to
Lubov Fominskaja [6]

Answer: I think maybe thru Convection?

Explanation:

cause convection causes the heat to stay to the top and the cold air stay's to the bottom so maybe i would say Convection.... Is there any answer choices?

8 0
3 years ago
A loop of current-carrying wire has a magnetic dipole moment of 5. 0 10–4 am2. if the dipole moment makes an angle of 57° with a
Digiron [165]

The potential energy will be 1.46*10^-4J.

To find the answer, we have to know about the torque acting on a current loop in a uniform magnetic field.

<h3>How to find the potential energy of the loop?</h3>
  • We have the expression for torque acting on a current loop in a uniform magnetic field as,

                         \tau=MBsin\theta

where; M is the magnetic dipole moment, B is the magnetic field , and theta is the angle between M and B.

  • As we know that, the torque is equal to force times the perpendicular distance. Thus, it is equivalent to the work done. This work is stored as the potential energy in the loop.
  • Thus, the potential energy will be,

            \tau=W=U=MBsin\theta=5*10^{-4}*0.35*sin57=1.46*10^{-4}J

Thus, we can conclude that, the potential energy will be 1.46*10^-4J.

Learn more about the torque here:

brainly.com/question/27949876

#SPJ4

7 0
1 year ago
OThy look jump mo I’ll I’ll
madreJ [45]
I have no idea what this means but I hope you are having a lovely day and that life treats you wonderfully because everyone deserves happiness. I hope you reach your goals that you’re pursuing. Have a nice day :)
6 0
3 years ago
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