Listed following are three possible models for the long-term expansion (and possible contraction) of the universe in the absence of dark energy. rank each model from left to right based on the ratio of its actual mass density to the critical density, from smallest ratio (mass density much smaller than critical density) to largest ratio (mass density much greater than critical density).
1. coasting universe
2. recollapsing universe
3. critical universe
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A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.
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Listed following are three possible models for the long-term expansion (and possible contraction) of...
Mathematics, 06.05.2020 05:39
Mathematics, 06.05.2020 05:39
Mathematics, 06.05.2020 05:39