Which best describes the present-day universe?
1. opaque, expanding very slowly, stars produce heavy elements
2. transparent, expanding at an accelerated rate, stars produce heavy elements
3. opaque, expanding at an accelerated rate, stars produce only hydrogen and helium
4. transparent, expanding very slowly, stars produce only hydrogen and helium
Answers: 3
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Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?
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Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?
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Which best describes the present-day universe?
1. opaque, expanding very slowly, stars produc...
1. opaque, expanding very slowly, stars produc...
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