Through what potential difference would an electron initially at ...

[SO00]

Through what potential difference would an electron initially at rest need to be accelerated to have its total energy be triple its rest energy? (me = 9.11  10-31 kg, c = 3.00  108 m/s, and qe = 1.6  10-19 C)
 a. 5.1  105 V
  c. 1.0  106 V
  b. 1.6  10-19 V
  d. 2.6  105 V

Question 2

In an X-ray tube, high-speed electrons are slammed into a lead target, giving off X-rays. If the electrons are accelerated from rest through a potential difference of 100,000 volts, what speed do they have when they strike the target? (qe = 1.6  10-19 C, me = 9.11  10-31 kg, and c = 3.00  108 m/s)
 a. 0.17c
  c. 0.91c
  b. 0.41c
  d. 0.55c

[lcapri7]

Answer to Question 1

C

Answer to Question 2

D

[SO00]

TY

[lcapri7]

You're welcome