In a TV picture tube electrons are ejected from the cathode with negligible speed and reach a velocity of 5 × 10 6 m/s in travelling one centimeter. Assuming straight line motion, find the constant force exerted on the electron. The mass of the electron is 9.1 × 10 -31 kg.

In a TV picture tube electrons are ejected from the cathode with negligible speed and reach a velocity of 5 × 10⁶ m/s in travelling one centimeter. Assuming straight line motion, find the constant force exerted on the electron. The mass of the electron is 9.1 × 10^-31 kg.

Given: initial velocity

Final velocity

Distance

Mass of the electron=

Using the equation of motion

Thus, acceleration

Thus, the force

1