For a given value of Hubble's constant, how does the age of the universe depend on the overall density of the universe?
What will be an ideal response?
The higher the density, the younger is the universe. This is because Hubble's constant measures the expansion rate at present. If the density is high, then the expansion has slowed substantially with time and must have been much faster in the past. Faster expansion in the past means it took less time for the universe to reach its current size, so the universe would be younger.
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You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
A. the same distance up as before, but take a shorter time. B. the same distance up as before, but take a longer time. C. a smaller distance up, but take a shorter time. D. a greater distance up, but take a longer time. E. a greater distance up, but take the same time.
The number of moles of solute per liter of solution is called the ______________ of the solution
Fill in the blank(s) with correct word
The planetary model of the atom was fundamentally flawed. It failed theoretically because
Define specific heat at constant pressure.
What will be an ideal response?