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Q. What are the conditions to achieve the laser action?
Conditions to achieve laser action
(i) There should be an inverted population that is more atoms in the excited state than in the ground state.
(ii) The excited state should be a metastable state.
(iii) The emitted photons should stimulate further emission. This is achieved by the utilize of the reflecting mirrors at the ends of the system.
A 0.150-kg ball that is thrown at a velocity of 30.0 m/s hits a wall and bounces back in the opposite direction with a speed of 25.0 m/s. How much work was done by the ball?
what is physics
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James Watt was the first inventor.
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