anonymous
  • anonymous
Find the potential difference ΔVe required to stop an electron (called a "stopping potential") moving with an initial speed of 1.96 107 m/s.
Physics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
We need to know the charge and mass of an electron. I'll assume you have these values handy (let me know otherwise and I can look them up). Volts have units of \[\rm joules \over coulombs\]If work also have units of joules. We can use the work-energy theorem, which states\[W = \Delta KE + \Delta PE\] we will assume there is no change in potential energy, therefore\[W = \Delta KE = {1 \over 2} m (v_f-v_i)\] This being said, let's observe that\[V = {(1/2) m (v_f-v_i) \over q}\]where q is the charge of an electron (in coulombs).

Looking for something else?

Not the answer you are looking for? Search for more explanations.