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
You might also like to view...
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.
White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively
A) high temperatures. B) few molecules per spark. C) low transfer of energy. D) all of the above E) none of the above
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
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?
A. 2.25 eV B. 1.79 eV C. 4.04 eV D. 0.460 eV E. 1.30 eV