Chapter 31, Problem 16A

To determine

To explain: Whether a laser can put out more energy than is put in or not.

Answer to Problem 16A

No, the laser cannot put out more energy than is put in.

Explanation of Solution

Introduction:

Laser can be explained as light amplification by stimulated emission of radiation. When excited atoms of any state of matter (solid, liquid or gas) are stimulated such that photons emit in phase, then the light emitted is known as laser light.

Laser cannot be considered as a source of energy but it is a converter of energy. The given statement does not require more knowledge about lasers as it is based on the law of conservation of energy. So, a laser cannot put out more energy than is put in because then the law of conservation of energy will be violated. Energy must be conserved.

Conclusion:

Hence, the laser cannot put out more energy than is put in.