For Part 1the energy to calculate is the Ki- netic Energy.(Units for answers: Jo

Question

For Part 1the energy to calculate is the Ki-

netic Energy.(Units for answers: Joules;

m/s)

An electrongun fires electrons at the screen

of atelevision tube. The electrons start from

rest and areaccelerated through a potential

difference of23500 V.

The chargeand mass on an electron are

1.6×1019 C and9.11×1031 kg,respectively.

A.)What is the energy of the electrons when

theyhit the screen?

Answer in units of J.

B.) What is the speed of impact ofelectrons with

thescreen of the picture tube?

Answer in units ofm/s.

Explanation / Answer

(a) Potential energy = eV = 1.6 x 10-19C * 23500V = 37600 x 10-19 eV = 60160 x10-38J (b) v = 2eV/m          Substitute values.              e = charge of electron              m = mass of electron              V = potential difference

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