What happens after a helium flash?
A) The core quickly heats up and expands.
B) The star breaks apart in a violent explosion.
C) The core suddenly contracts.
D) The core stops fusing helium.
E) The star starts to fuse helium in a shell outside the core.
A
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How many neutrons are produced in the induced fission reaction 
neutrons?
A. 2 B. 0 C. 1 D. 3
The average distance of the electron from the proton in the hydrogen atom is 0.65 × 10^?10 m. What is the electric field from the proton's charge at the location of the electron? (ke = 8.99 × 10^9 N/m2/C2, e = 1.6 × 10^?19 C)
a. 3.4E+11 N/C b. 5.4E+6 N/C c. 5.2E+1 N/C d. 2.2E–8 N/C e. 1.0E–8 N/C
How much time is there between when a star rises and when it sets?
A. about twelve hours B. more than twelve hours C. less than twelve hours D. It depends on the star.