An electron gun tires electrons at the Screen of a television tube. The electron

Question

An electron gun tires electrons at the Screen of a television tube. The electrons start from rest and are accelerated through a potential difference of 22000 V. What is the energy of the electrons when they hit the screen? The elemental charge is 1.6 Times 10-19 C and the mass of an electron is 9.11 Times 10-31 kg. Answer in units of J What is the speed of impact of electrons with the screen of the picture tube? Answer in units of m/s A proton is accelerated from rest through a potential difference of 129 V. Calculate the final speed of this proton. The mass of a proton is 1.673 Times 10-27 kg and the elemental charge is 1.602 Times 10-19 C. Answer in units of m/s

Explanation / Answer

q*V=1/2*m*V^2

a.) Kinetic energy=q*E

=3.52*10^-15 J

b.)V=sqrt(2*q*V/m)

=8.79*10^7 m/s

c.)q*e=1/2m*v^2

V=sqrt(2*q*V/m)

=1.57*10^5 m/s ans

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