Explanation:
Power output of the bulb:
0.021 × 60 W = 1.26 W
Energy produced by the bulb in 1 second:
E = Pt
E = (1.26 W) (1 s)
E = 1.26 J
Round as needed.
The star is moving toward the earth.
It is due to the phenomenon of the Doppler shift.
The <u>Doppler effect</u>, commonly referred to as "Doppler shift," is the <u>change in the wavelength </u>or frequency of waves as a result of an observer's motion in relation to the wave source.
It is possible to see this<u> apparent wavelength </u>change in the visible light emitted by stars and galaxies.
As a result, a star moving toward Earth appears to emit light with a shorter <u>wavelength</u> than a light source that is stationary. It is known as blueshift because <u>shorter wavelengths</u> cause the spectrum to shift toward the <u>blue end</u>.
While a star traveling away from us appears to shift its light towards longer wavelengths. Astronomers refer to this as redshift since it is closer to the <u>red end of the spectrum.</u>
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As the spectrum of a particular star shows the hydrogen line appearing at a shorter wavelength of 480 nm in comparison to the laboratory measurements, that show the same hydrogen lines at a greater wavelength of 500 nanometers, that’s why we conclude that the star is moving toward earth.
Learn more about Doppler shift here brainly.com/question/23841569
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Answer:
TRUE
Explanation:
the correct answer is TRUE
Compound microscope is one of the useful instrument which is used to view the objects at microscopic level.
We observe the objects at microscopic level because we want to study the nature of that object , gather information or many more objectives.
In compound microscope light source is beneath the specimen. it help to view the thin specimens very clearly.
hence, the statement is true.
Answer:
a = 40 m / s²
Explanation:
This is a kinematics problem, where we must use both linear and angular and the relationship between them
we'll eat by reducing the angular velocity to units if
w = 1.0 rev / s (2pi rad / 1 rev) = 2pi rad / s
they ask us for linear acceleration, we use the relationships between linear or angular variables
a = α R
a = 20 2
a = 40 m / s²