Hey everyone, My professor just posted this review question: “In a small TV pict

Question

Hey everyone,

My professor just posted this review question:

“In a small TV picture tube, an electron moves horizontallyat 5 x 10 m/s through the space between two 4 cm x 4 cm horizontaldeflection plates separated by 1 cm. The potential differencebetween the plates is 3000 V. (a) How long is the electron in thedeflecting electric field? (b) Calculate the vertical impulse givento the electron. (c) What is the vertical component of theelectron’s velocity after it leaves the deflectionplates?”


He wrote that the answers are:
4. a. 8 x 10-10 s b. 3.85 x 10-23 Ns c. 4.2 x 107 m/s

Unfortunately, I don’t understand how he got those. Couldsomeone please explain this to me? I will definitely rate high ifyou give a good explanation. Thanks so much!

Explanation / Answer

the time electron spend between the plates                     t = distance /velocity                       = 0.04 m / 50 m/s force that acts on the electron when it travells thruthe gap                  F = qV q = charge of electron V = potential difference between the plates                  and accleration a = F / m      m = mass of the electron deflection of the electron from its intial pathdirection be ' S '                    S = at^2 / 2            veticle impulse on te electron I = p = mv m = electron mass v = verticle component of velocity           v = at     pluggin in the given values we can sovle above equationssequentially .

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