Question

The Kinetic energy of moving electron having mass, 11 times of its rest mass is:​

Answer 1

Answer:

Electron's 'rest' mass is 9.11

• 10^-31 kg. So the KE is 1/2mv^ = 1/2(11 9.11)

• (10^-31 kg)(2.975 • 10^8 m/s)^2= 443.461 • 10^-15 J or 4.4346 • 10^-13 J(Joules).