In a television tube,an electron starting from rest experiences a force of 4.0 $\times$ 10^-15N over a distance of 50 cm.The final speed of the electron is (do not worry about relativistic effects): A)4.4 $\times$ 10¹⁵ m/s B)6.6 $\times$ 10⁷ m/s C)3.3 $\times$ 10⁷ m/s D)1.3 $\times$ 10⁸ m/s E)6.6 $\times$ 10⁸ m/s

Question

Quizplus · Accepted Answer

The work done on the electron is equal to the change in kinetic energy. Using the work-energy principle, W = F * d = 0.5 * m * v^2, where F = 4.0 x 10^-15 N, d = 0.5 m, and m (mass of electron) = 9.11 x 10^-31 kg. Solving for v gives approximately 3.3 x 10^7 m/s.

In a Television Tube,an Electron Starting from Rest Experiences a Force