Inside most old fashioned (\"tube\") TV sets you will find two parallel charged

Question

Inside most old fashioned ("tube") TV sets you will find two parallel charged plates designed to accelerate electrons. Let's assume an electron (mass m = 9.11

Inside most old fashioned ("tube") TV sets you will find two parallel charged plates designed to accelerate electrons. Let's assume an electron (mass m = 9.11times10-31 kg) is accelerated in the uniform field E (E = 6.65times103 N/C) between the plates shown in the figure. (The thickness of the plates themselves is negligible, despite how fat they might look in this picture) The electron starts from rest near the negative plate and passes through a tiny hole in the positive plate, as seen in the figure below. It exits with a kinetic energy of 1.39times10-17 J (which, as we will see later in this course, is enough to generate light when it finally hits the phosphors on the front screen!)

Explanation / Answer

q*v = 0.5*m*v^2

q*E*d = KE

d = KE/(q*E) = 0.05944 m = 5.94 cm

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