I know that these are relatively easy questions, but I'm having some difficulty with them.
How much work does the electric field do in moving a proton from a point with a potential of +1.30E2 V to a point where it is -25 V? Express your answer both in joules and electron volts.
How much kinetic energy will an electron gain (in joules and eV) if it accelerates through a potential difference of 2.2E4 V in a TV picture tube?
for the first one i've tried using the equation PEb-PEa=-Wba, and i'm not getting the right answer.
the second one im not really sure how to work it.
Any help will be greatly appreciated!
2007-02-06 07:08:27 · 1 answers · asked by number1toolfool 2 in Science & Mathematics ➔ Physics
A. W=(V2-V1)q (potential difference times the charge)
W=(+1.30E2 +25 )V 1.6021892 E-19 coulomb
W= 24.8E-18 Joules
B. Ek=Vq (again potential difference times the charge)
Ek=2.2E4 x1.6021892 E-19 =3.52E-15 Joules
2007-02-06 07:39:45 · answer #1 · answered by Edward 7 · 0⤊ 0⤋