When a charge is accelerated through a potential difference of 500 V, its kinetic energy increases from 2.0 x 10^ -5 J to 6. 0 x 10^ -5 J. What is the magnitude of the charge?
2 points
a. 4.0 x 10 -8 C
b. 8.0 x 10 -8 C
c. 1. 2 x 10 -7 C
d. 1. 6 x 10 -7 C

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wavelength divides in half and speed stays the same.