What is the fate of the universe? Will the universe continue to expand or will it eventually contract because of gravity?
What will be an ideal response?
Answer: Teacher tip It was previously thought that the gravity would eventually stop the expansion and end the universe with a “Big Crunch” and perhaps to generate another “bang” . This would occur if the density of the universe is greater than the critical density. But if it is lower, there would be not enough gravitational force to stop or reverse the expansion---the universe would expand forever leading to the “Big Chill” or “Big Freeze” since it cools during expansion. The recent observation of accelerating expansion suggests that the universe will expand exponentially forever. Submitted work may be evaluated using the following criteria: •Logical discussion of scientific concepts used for the argument (egeffects of gravity, expansion), consistent discussions of pros and cons •Logical build up of reasoning to support the choice.
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In order for a circuit to respond quickly, its time constant should be short. In a circuit involving resistance and capacitance, which of the following choices would result in the shortest time constant?
a. R = 75 W, C = 75 mF c. R = 300 W, C = 75 mF b. R = 200 W, C = 200 mF d. R = 100 W, C = 30 mF
If the index of refraction for a silica glass fiber is 1.46, which of the following of refraction indices for a coating would produce total internal reflection?
(a) 1.30 (b) 1.46 (c) 1.50 (d) 1.60
In a Compton scattering experiment, the scattered photon has a wavelength of 6.55 pm. If the scattering angle is 
what is the wavelength of the incident photon?
A. 5.68 pm B. 7.42 pm C. 3.28 pm D. 0.868 pm E. 2.43 pm
Consider the following reaction. ?+ + n ? ?– + p This reaction is impossible because it violates which conservation law?
a. baryon number b. lepton number c. strangeness d. charge e. two of the above