Why does the Big Bang theory predict that the cosmic background radiation should have a perfect thermal radiation spectrum?
A) The background radiation came from the heat of the universe, with a peak corresponding to the temperature of the universe.
B) The spectrum of pure hydrogen is a perfect thermal radiation spectrum.
C) The spectrum of 75 percent hydrogen and 25 percent helium is a perfect thermal radiation spectrum.
D) The light from all the stars and gas in the sky averaged over the entire universe is a perfect thermal radiation spectrum.
E) It doesn't predict that the cosmic background radiation should have a perfect thermal radiation spectrum.
A
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During the month of June the north celestial pole points towards Polaris, but during the month of December it points
a. just north of Polaris. b. just south of Polaris. c. towards the star Vega. d. towards the star Thuban. e. still towards Polaris.
If 40 kcal of heat is added to 2.0 kg of water, what is the resulting temperature change?
A) 80C° B) 60C° C) 40C° D) 20C° E) 0.05C°
The radius of a typical nucleus is about 5 × 10-15 m
Assuming this to be the uncertainty in the position of a proton in the nucleus, estimate the uncertainty in the proton's energy, in MeV. (mproton = 1.67 × 10-27 kg, h = 6.626 × 10-34 J ? s, 1 eV = 1.6 × 10-19 J) A) 0.8 MeV B) 1.0 MeV C) 0.6 MeV D) 0.4 MeV
What is the reason that glass is less of an energy saver than steel or aluminum if it is recycled? Explain your reasons for your answer
What will be an ideal response?