Early black-and-white television sets used an electron beam to draw a picture on the screen. The electrons in the beam were accelerated by a

Question

Early black-and-white television sets used an electron beam to draw a picture on the screen. The electrons in the beam were accelerated by a voltage of 3.0 kV; the beam was then steered to different points on the screen by coils of wire that produced a magnetic field of up to 0.65 T .

What is the speed of electrons in the beam?

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Diễm Thu 4 years 2021-07-29T21:35:58+00:00 1 Answers 16 views 0

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  1. niczorrrr
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    2021-07-29T21:37:06+00:00
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    Answer:

    3.25 × 10^7 m/s

    Explanation:

    Assuming the electrons start from rest, their final kinetic energy is equal to the electric potential energy lost while moving through the potential difference (ΔV)

    Ek = 1/2 mv2 = qΔV ……………… 1

    Given that V is the electron speed in m/s

    Charge of electron = 1.60217662 × 10-19 coulombs

    Mass of electron = 9.109×10−31 kilograms

    ΔV = 3.0kV = 3000V

    Make V the subject of the formula in eqaution 1

    V = sqr root 2qΔV/m

    V = 2 × 1.60217662 × 10-19 × 3000 / 9.109×10−31

    V = 3.25 × 10^7 m/s

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