What are some sources of the shock waves that initiate star formation?
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Emission nebulae produce shock waves, resulting from their hot ionized gases. Supernovae are an excellent source of shock waves. Both of these are caused by O-B stars. Collisions between galaxies can also initiate star formation on a grand scale in "starburst" galaxies.
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How does the mass of Jupiter compare with that of the other planets?
A) It is slightly larger and more massive than Saturn. B) It is similar to that of the Earth and Venus. C) It is twice as massive as all other planets combined. D) It is almost as massive as Saturn. E) It is about a tenth the mass of the Sun.
What energy must be added or given off in a reaction where a helium atom is separated into two hydrogen atoms and two neutrons? (Atomic masses for each: hydrogen, 1.007825 u; neutron, 1.008665 u; helium, 4.002602 u; also, 1 u = 931.5 MeV/c2.)
a. 28.3 MeV given off b. 20.7 MeV added c. 20.7 MeV given off d. 28.3 MeV added
Light with wavelength 5.6 × 10^–7 is used to determine the position of an electron to within the wavelength of the light. What is the resulting uncertainty in the electron's velocity? h = 6.63 × 10^–34 J?s, me = 9.11 × 10^–31 kg
a. 1300 m/s b. 103 m/s c. 207 m/s d. 16,331 m/s
If the surface of our bodies is at 37°C, at what wavelength does the radiation that we emit peak if we behave like a blackbody? The constant in Wien's law is 0.0029 m ? K
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