Answer:
The answer is "
"
Explanation:
In point i:


If error in the theoretical time period
:



In point ii:

<h3>

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Answer:
Using g = 9.8: 1.02 kg, Using g = 10: 1 kg
Explanation:
E = mgh
20 = m(9.8)(3 - 1)
20 = 9.8m(2)
20 = 19.6m
m = 1.02 kg
I'm now assuming you may be using a g constant of 10, thus the close integer result, in which case the mass would be exactly 1 kilogram.
I believe that the answer is C<span />
Electrons that are further away from the nucleus have more energy. As they enter an "excited" state, they jump up orbits.