A laser is used to make a CD or DVD by _____.
cutting patterns of pits into a blank plastic disc
burning grooves into a blank plastic disc
creating a holographic surface on a plastic disc
reflecting coherent light off grooves in a disc
9 answers
cutting patterns of pits into a blank plastic disc
What does “stimulated emission of radiation” mean?
Gas particles in a laser emit coherent light when bombarded with X-rays.
Radioactive particles in a laser emit gamma rays of the same wavelength.
Gas particles in a laser emit photons of light when exposed to an electric current.
Electromagnetic currents are produced by neon particles when they bump into helium particles.
Gas particles in a laser emit coherent light when bombarded with X-rays.
Radioactive particles in a laser emit gamma rays of the same wavelength.
Gas particles in a laser emit photons of light when exposed to an electric current.
Electromagnetic currents are produced by neon particles when they bump into helium particles.
Gas particles in a laser emit photons of light when exposed to an electric current.
How is laser light different from the light produced by a flashlight?
Flashlights use reflecting mirrors and lasers do not.
The crests of laser light waves align with one another.
Lasers produce multiple wavelengths of light.
Lasers produce light that is incoherent.
Flashlights use reflecting mirrors and lasers do not.
The crests of laser light waves align with one another.
Lasers produce multiple wavelengths of light.
Lasers produce light that is incoherent.
The crests of laser light waves align with one another.
How is light amplified in a laser?
Photons “leak” through a partially reflecting mirror, causing them to travel in step.
Photons collide with gas particles, multiply, and reflect back and forth in a tube.
Integrated circuits in a laser amplify the sound produced by photon emission.
Electric current is amplified and directed into gas particles, which emit photons.
Photons “leak” through a partially reflecting mirror, causing them to travel in step.
Photons collide with gas particles, multiply, and reflect back and forth in a tube.
Integrated circuits in a laser amplify the sound produced by photon emission.
Electric current is amplified and directed into gas particles, which emit photons.
Photons collide with gas particles, multiply, and reflect back and forth in a tube.
What is an advantage of using a laser over a scalpel for surgery?
A laser can cut through tissue.
A laser also seals blood vessels.
A laser can cut through bones.
Laser surgery is much faster.
A laser can cut through tissue.
A laser also seals blood vessels.
A laser can cut through bones.
Laser surgery is much faster.
A laser also seals blood vessels.