In an electron microscope, there is an electron gun that contains two charged me

Question

In an electron microscope, there is an electron gun that contains two charged metallic plates 2.90 to 8.40% of the speed of light over this distance. (Ignore the effects of relativity in your calculati (a) Determine the kinetic energy of the electron as it leaves the electron gun. Electrons c image is formed, making it glow. Enter a number (b) For an electron passing between the plates in the electron gun, determine the magnit (c) Determine the acceleration of the electron. m/s (d) Determine the time interval the electron spends between the plates.

Explanation / Answer

a) KE = 0.5*(9.11*10^-31)*(0.0840*3.0*10^8)^2 = 2.89*10^-16 J

d) time, 't' required for acceleration = 0.029/[0.5*0.0840*3.0*10^8], where [0.5*0.09*3.0*10^8] m/s is average velocity, or

t = 2.3*10^-9 s

c) acceleration, a = v/t = [0.0840*3.0*10^8]/[2.3*10^-9] = 1.09*10^16 m/s^2

b) Force = m*a = (9.11*10^-31)*( 1.09*10^16) = 9.9299*10^-15 N

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