according to bohr atom,eletron will revolve around the stationary orbit untill it remains in that stationary.?

Question

orbit?
my ques is
1.why can't eletron lose its energy in that paricular stationary orbit?
2.from where it get the energy?

Answer 1

1.why can't eletron lose its energy in that paricular stationary orbit?

if the model was accurate, the electron would be radiating energy while in it's orbit, losing energy would reduce the radius of orbit... but such radiation has not been observed. so it not that it "can't" or couldn't lose energy, the fact is that it doesn't happen in an atom.
in say a cyclotron, which involves the electrons going in a big circular path, they do radiate energy

2.from where it get the energy?

well the electron doesnt get energy..... this (and the above) is why that model of the atom that you've mentioned is not the current model used by physicists. it's inaccurate.

Answer 2

That's why the Bohr model needs to be augmented by quantum physics. Classical physics says that the electron should lose energy. The fact that it apparently doesn't gradually lose energy, but at some point suddenly loses a quantum of energy, as it drops to a lower energy orbit, was one of the first clues that things behave differently at the quantum scale.