Author Question: Why does a battery that has thick zinc walls last longer than one that has thin zinc walls? A) ... (Read 105 times)

piesebel · **on:** Aug 27, 2018

Why does a battery that has thick zinc walls last longer than one that has thin zinc walls?

A) Thick zinc walls prevent the battery from over heating.
B) Thicker zinc walls prevent electrons from being lost into the surrounding environment.
C) Thicker zinc walls last longer at holding in the battery acid.
D) The zinc walls are transformed into zinc ions as the battery provides electricity.

Question 2

The original reactor built in 1942 was just barely critical because the natural uranium that was used contained less than 1 of the fissionable isotope U-235 (half life 713 million years).

What if, in 1942, the Earth had been 9 billion years old instead of 4.5 billion years old? Would this reactor have reached critical stage with natural uranium? Why? A) No. The age of the Earth has nothing to do with the reactor reaching critical stage with U-235.
B) No. 1 of the fissionable isotope U-235 is insufficient for the reactor to reach critical stage no matter what the age of the Earth.
C) Yes. If the Earth had been twice as old there would have then been twice as much fissionable U-235 present and the reactor would have reached critical stage.
D) No. The increased age of the Earth would mean that there would be a much smaller percentage of U-235, thus not enough for the reactor to reach critical stage.