CSS - PMS - CCE - PCS - General Science
Modern Physics - Lasers
Which is a common laser application?
A. Measuring mass with a balance only
B. Barcode scanning
C. Boiling water only
D. Producing gravity
Correct Answer: B
Lasers are widely used in scanning, communications, medicine, manufacturing and research.
CSS - PMS - CCE - PCS - General Science
Modern Physics - Lasers
Which component reflects light back and forth through the gain medium in many lasers?
A. Thermometer
B. Optical cavity with mirrors
C. Ammeter
D. Battery only
Correct Answer: B
The resonator provides feedback and selects optical modes.
CSS - PMS - CCE - PCS - General Science
Modern Physics - Lasers
What is population inversion?
A. No atoms present
B. Equal numbers of photons and electrons only
C. All atoms in the ground state
D. More particles in an excited state than in a lower relevant state
Correct Answer: D
Population inversion is required for net optical amplification.
CSS - PMS - CCE - PCS - General Science
Modern Physics - Lasers
What is stimulated emission?
A. A photon splits into protons
B. An incoming photon triggers an excited atom to emit a matching photon
C. A mirror generates matter
D. An atom absorbs all light permanently
Correct Answer: B
Stimulated emission produces photons matching the stimulating photon in key properties.
CSS - PMS - CCE - PCS - General Science
Modern Physics - Lasers
What is a key property of laser light?
A. Always many unrelated wavelengths
B. No directionality
C. High coherence
D. Always low intensity
Correct Answer: C
Laser light has a high degree of temporal and spatial coherence.
CSS - PMS - CCE - PCS - General Science
Modern Physics - Lasers
What does LASER stand for?
A. Light Absorption by Simple Energy Reflection
B. Linear Amplification of Sound Energy Radiation
C. Light Addition by Solar Emission Rays
D. Light Amplification by Stimulated Emission of Radiation
Correct Answer: D
A laser uses stimulated emission to amplify coherent light.