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2 years ago

9

Astronomers use a special kind of instrument called a spectrometer to analyze stars. Spectrometers can determine what stars are

made of even if the stars are very far away. How is it possible for spectrometers to do this?

1 answer:

marshall27 [118]2 years ago

4 0

The approval of the stars

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If you place a piece of paper containing a small letter "d" on the stage, what will the image look like under the microscope?

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Answer:

it will be

B.

p

Explanation:

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Early black-and-white television sets used an electron beam to draw a picture on the screen. The electrons in the beam were acce

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Answer:

speed of electrons = 3.25 × $10^{7}$ m/s

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Explanation:

given data

voltage = 3 kV

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solution

law of conservation of energy

PE = KE

qV = 0.5 × m × v²

v = $\sqrt{\frac{2qV}{m}}$

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and

magnetic force on particle movie in magnetic field

F = Bqv

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a = $\frac{3.82\times 10^{18}}{9.81}$

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and

electron moving in circular orbit has centripetal force

F = $\frac{mv^2}{r}$

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r = $\frac{mv}{Bq}$

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r = 2.76 × $10^{-4}$ m

radius of circular orbit is 2.76 × $10^{-4}$ m

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I'll say B ....hope that helps...

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Answer:

increases, decreases, respiration

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