Physics, 16.04.2020 23:58 jeffrey74081
Astronomers find that clouds of gas throughout the universe are composed primarily of|hydrogen. They know this because when they look at light emitted by these clouds they see a distinct bright line corresponding to a wavelength of 21 cm (too long to be observable with our eyes, but detectable by radio telescopes). This wavelength of light is known to be associated with hydrogen and not with other elements. This is an example of astronomers looking at what type of spectrum (absorption, emission, or continuous)
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Physics, 21.06.2019 16:00
Stion 13 of 20 : select the best answer for the question. 13. if a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°c, what will be the volume at 50°c? a. 0.002021624 m3 b. 0.004021624 m3 c. 0.000010812 m3 d. 0.002010812 m3
Answers: 1
Physics, 21.06.2019 20:00
What happens to atoms and chemical bonds during a reaction?
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Physics, 22.06.2019 07:50
Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?
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Physics, 22.06.2019 09:00
Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than
Answers: 3
Astronomers find that clouds of gas throughout the universe are composed primarily of|hydrogen. They...
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