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denpristay [2]
3 years ago
15

Find the speed for a star in which this line appears at wavelength 120.2 nm . Express your answer to three significant figures a

nd include the appropriate units. v
Physics
1 answer:
levacccp [35]3 years ago
8 0

Answer:

The speed of the star is -3.45x10^{6}m/s

Explanation:

Spectral lines will be shifted to the blue part of the spectrum if the source of the observed light is moving toward the observer, or to the red part of the spectrum when it is moving away from the observer (that is known as the Doppler effect).

Redshift: \lambda_{measured}  >  \lambda_{0}

Blueshift: \lambda_{measured}  <  \lambda_{0}

The wavelength at rest is 121.6 nm (\lambda_{0} = 121.6nm)

Due to that shift the velocity of the star can be determined by means of Doppler velocity.

v = c\frac{\Delta \lambda}{\lambda_{0}} (1)

Where \Delta \lambda is the wavelength shift, \lambda_{0} is the wavelength at rest, v is the velocity of the source and c is the speed of light.

v = c(\frac{\lambda_{measured}- \lambda_{0}}{\lambda_{0}})

In this case \lambda_{measured} is equal to 120.2 nm.

v = (3x10^8m/s)(\frac{120.2 nm - 121.6 nm}{121.6 nm)})

v = -3.45x10^{6}m/s

Hence, the speed of the star is -3.45x10^{6}m/s.

Notice that the negative velocity means that the star is moving toward the observer.

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8892 ml to grams then to mg ​
andrew11 [14]

Answer:

8892 ml = 8892 gm = 8892000 mg

1 ml = 1 gram

8892 ml = 8892 gram

1 gram or ml = 1000 milligram

8892 ml = 8892 × 1000 = 8892000 milligram

hope this helps

have a good day :)

Explanation:

remember: 1 kilogram = 1000 gram = 1000000 milligram.

Milliliter is expressed same as gram and liter is expressed same as kilogram.

1 meter = 100 cm, 1 kilometer = 1000 meter,

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An object moves from point A to point C along the rectangle shown in the figure below.
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What is the kinetic energy of a 120-cm thin uniform rod with a mass of 450 g that is rotating about its center at 3.60 rad/s?
goldfiish [28.3K]

Answer:

1.05 J.

Explanation:

Kinetic Energy: This is the energy possessed by a body due to its motion. The S.I unit of kinetic energy is Joules (J). The formula of kinetic energy is given as

Ek = 1/2mv²................. Equation 1

Where Ek = kinetic energy, m = mass of the uniform rod, v = liner velocity of the rod.

But,

v = αr .......................... Equation 2

Where α = angular velocity of the rod, r = radius of the circle.

Given: α = 3.6 red/s, r = 120/2 = 60 cm = 0.6 m.

Substitute into equation 2

v = 3.6(0.6)

v = 2.16 m/s.

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The objects must be different temperatures.

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Temperature is the degree of hotness or coldness of body. It is power by heat energy between two bodies.

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