Answer to Question 4

 

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An electron is accelerated by a voltage of 1300 V.  What is its speed?

Give your answer to an appropriate number of significant figures.

Mass of an electron = 9.11 10-31 kg; Charge on an electron = 1.602 10-19 C

 

Formula:

v2 = 2 1.602 10-19 C 1300 V = 4.5721 1014 m2 s-2

                      9.11 10-31 kg

 

v = 2.14 107 m s-1 (3 s.f. as the mass of the electron is to 3 s.f.)