If the Hubble parameter is 25 km/s per million light years, how old is the universe?

A)

10 × 109 y
B)

12 × 109 y
C)

15 × 109 y
D)

20 × 109 y
E)

25 × 109 y


B

Physics & Space Science

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Optical pumping of a ruby laser is done with photons absorbed at energy 2.25 eV. The laser light consists of photons of energy 1.79 eV in a transition that goes to ground. What is the energy of the transition from the pumped stated to the lasing state?

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A 5-N block of wood is difficult to fully submerge in a pool of mercury because the buoyant force on the block when submerged is

A) less than 5 N. B) 5 N. C) much more than 5 N.

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Which of the above might best describe how soap behaves in a nonpolar solvent like turpentine?

A) a B) b C) c D) d E) none of the above

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