OCN-U3

1. What does the acronym LASER stand for?

• a) Light and Sound Energy Resonance

• b) Light Amplification by Spontaneous Emission of Radiation

• c) Light Amplification by Stimulated Emission of Radiation

• d) Light Absorption by Stimulated Emission of Rays

2. Which of the following is a key characteristic of laser light?

• a) Divergent

• b) Incoherent

• c) Monochromatic

• d) Omnidirectional

3. The process of stimulated emission occurs when:

• a) An electron absorbs energy

• b) A photon triggers an excited electron to emit a photon

• c) Electrons are in the ground state

• d) Electrons are repelled by protons

4. In a laser, what role does the optical cavity play?

• a) Absorbs photons

• b) Amplifies light by allowing stimulated emission

• c) Excites electrons to higher energy levels

• d) Produces incoherent light

5. What is population inversion in the context of lasers?

• a) A state where there are more electrons in the ground state than in the excited state

• b) A state where more atoms are in the excited state than the ground state

• c) A state where atoms are in random energy states

• d) A state where no emission occurs

6. Which type of laser is most commonly used in laser pointers?

• a) Gas laser

• b) Diode laser

• c) Solid-state laser

• d) Dye laser

7. He-Ne laser emits light in which region of the electromagnetic spectrum?

• a) Ultraviolet

• b) Infrared

• c) Visible (red light)

• d) X-ray

8. In lasers, the process of spontaneous emission results in:

• a) Coherent light

• b) Incoherent light

• c) Polarized light

• d) Unidirectional light

9. Which of the following is NOT a type of laser?

• a) CO2 laser

• b) Ruby laser

• c) Fiber laser

• d) Sodium laser

10. The threshold condition in a laser refers to:

• a) The minimum energy required for photon absorption

• b) The point where the optical gain equals the losses in the cavity

• c) The maximum power the laser can output

• d) The level at which the laser turns off