Question

1) How much kinetic energy does a proton gain if it is accelerated, with no friction, through a potential difference of 1.00 V? The proton is 1836 .60 x 10-19 C A) 1836 ev B) 1.00 eV C) 1.60 x 10-19 eV D) 1.00J E) 1836J times heavier than an electron, and e = 1
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Answer #1

Answer is B) 1.00eV

Electrostatic force is a conservative force.Which means conservation of mechanical energy is valid.

=> P.E. + K.E. = same.

=> gain in kinetic energy= lost in potential energy =qV =e x 1.0V = 1.0 eV

                                        

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