What will be the speed of an electron if it possesses 30ev energy?

Answer 1

You can solve that by using the formula for kinetic energy. (KE = (1/2)mv2 - since that is a fairly low energy, I don't think you need the more complicated relativistic formula). I would suggest you first convert the energy to joules.

Answer 2

Using the equation ( KE = \frac{1}{2}mv^2 ), where KE is the kinetic energy of the electron (in joules), m is the mass of the electron, v is the velocity of the electron, and 1 eV is equal to 1.6 x 10^-19 joules, you can calculate the speed of the electron. With 30 eV of energy, the velocity of the electron will be approximately 5.93 x 10^6 m/s.