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WorksheetsOCN-U3
Total questions: 10
Worksheet time: 5mins
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
