Physics Review Question Unit: Electricity and Magnetism Year: 1991 Question#: 28 Question: How much energy is needed to move one electron through a potential difference of 1.0 x 102 volts? (1 ) 1.0 J (2 ) 1.0 x 102 J (3 ) 1.6 x 10-19 J (4 ) 1.6 x 10-17 J What is this question really asking? Explanation by: Derek N [ Return to question menu ] Answer 1 1.0 J INCORRECT Try using the formula V=W/q and remember to convert 1 elementary charge into coulombs. return to top Answer 2 1.0 x 102 J INCORRECT Try using the formula V=W/q and remember to convert 1 elementary charge into coulombs. return to top Answer 3 1.6 x 10-19 J INCORRECT This is the nember of coulombs in 1 elementary charge (or the number of joules in 1 eV) but it is not the answer you are looking for. Try using the formula V=W/q and remember to convert 1 elementary charge into coulombs. return to top Answer 4 1.6 x 10-17 J CORRECT Using the formula V=W/q you get 100v=W/ 1.6 x 10-19 multiply 100v by 1.6 x 10-19C and work will equal 1.6 x 10-17 J return to top What's this question really asking? How much energy do you need to move an electron across 100 volts? return to top |
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