1) If we define the potential energy of the electron as 0 when it is infinitely
ID: 582210 • Letter: 1
Question
1) If we define the potential energy of the electron as 0 when it is infinitely far from the proton, what is its potential energy when D = 0.025 nm (in eV)? Make sure to consider the sign of your answer. (Please enter in the format XX.X eV)
2 )If we double the distance, what happens to the potential energy of the electron? (Choose all that apply.)
A) It becomes more negative.
B) It becomes less negative.
C) It becomes more positive.
D) It becomes less positive.
E) ...by a factor of 1/4.
F) ...by a factor of 1/2.
G) ...by a factor of 2.
H) ...by a factor of 4.
I) ...PE does not change.
Explanation / Answer
Va -Vb =k*Q*(1/ra - 1/rb)
here rb=infinity.Vb=0
k=9*10^9
Va = k*Q*(1/0.025*10^-9) = 3.6 *10^21 eV
F)bya a factor of 1/2
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