What reactions would start in its core?
A: Iron breaking into lighter elements
B: Hydrogen fusing into Helium
C: Oxygen burning
D: Carbon burning
E: None of the above
Ans: B: Hydrogen fusing into Helium
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Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A) 1.4c B) 0.94c C) 0.98c D) 0.82c E) 0.70c
Which of the following statements about neutrinos is true?
A) Neutrinos can be attracted or repelled by electrically charged particles. B) Neutrinos have a mass that is much larger than the mass of an electron. C) Neutrinos respond to the strong nuclear force. D) There are three types of neutrinos, and these represent three of the six known types of lepton. E) Neutrinos respond to the force of gravity.
The quark structure of the neutron is udd
a. True b. False Indicate whether the statement is true or false
About 78% of the air is composed of
a)carbon dioxide. b)oxygen. c)nitrogen. d)argon.