Why does the Big Bang theory predict that the cosmic microwave background should have an essentially perfect thermal radiation spectrum?
A) This radiation came from the heat of the universe itself.
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) The first stars that formed in the universe must all have had the same temperature.
A) This radiation came from the heat of the universe itself.
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Indicate whether the statement is true or false
By what process do nuclear power plants on the Earth generate energy?
A) converting gravitational potential energy into electricity B) nuclear fission C) converting kinetic energy into electricity D) chemical reactions E) nuclear fusion
A stopping potential of 3.2 V is needed for radiation whose wavelength is 200 nm. What is the work function (in eV) of the material?
a. 4.0 b. 3.0 c. 5.0 d. 6.0 e. 2.0
A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together
(a) What is the speed of the wreckage just after the collision? (b) In what direction does the wreckage move just after the collision?