According to Bohr's theory , the electrons revolve round the nucleus in definite paths called orbits . Do the electrons revolve round with same speed in all orbits? Justify.

Explanation

The electrons revolve round the nucleus at high speed in the orbits in order to counterbalance the nuclear forces of attraction. As nuclear force of attraction decreases with increase in distance from the nucleus, the nuclear force of attraction on the electrons decreases. Therefore, electron revolves with lesser velocity to overcome lesser nuclear force of attraction. Thus, the velocity of electron in orbits decreases in the order ` K gt L gt M gt N`.