5.3 Light Technology

Which of the following is an example of a way that light can transmit information?

• eyeglasses
• neon lights
• laser welder
• bar code scanner

What is one of the earliest ways that ancient people produced light?

• candles
• light emitting diodes
• fluorescent bulbs
• incandescent bulbs

A scientist is studying great horned owls in the wild. Which of the following technologies would most help the scientist observe the birds from a distance?

• binoculars
• microscope
• laser scanner
• light-emitting diode screen

How do incandescent bulbs produce light?

• Light of one color is concentrated and amplified.
• Material inside the bulb becomes hot and produces light.
• Gases within the bulb are energized by an electric current and interact with a prosphor coating.
• Solid materials within the bulb are energized by an electric current.

The following image A shows one type of light technology. What technology is shown and what is one of its uses?

• laser; cutting through metal
• LED; illuminating a telvision screen
• fluorescent light; illuminating a dark room
• fiber optic cable; moving light through small openings

Which of the following light technologies is known for losing very little light during transmission?

• LED lights
• laser lights
• fiber optics
• incandescent bulbs

What form of light does Doppler radar use?

• optical fiber
• laser light
• radio waves
• microscopes

What type of light technology emits light by energizing solid particles with an electric current?

• LED
• laser
• incandescent
• NO type of light is produced by energized solid particles.

How do LED lights differ from fluorescent light?

• LEDs emit light because of heat; fluorescent bulbs emit light because of energized solids.
• LEDs emit light by concentrating wavelengths of light; fluorescent bulbs emit light because of heat.
• LEDs emit light because of energized solids; fluorescent bulbs emit light because UV light interacts with a phosphor coating.
• LEDs emit light because UV light interacts with a prosphor coating; fluorescent bulbs emit light by concentrating wavelengths of light.

Which device can transmit signals using light and what is the method?

• Fiber optics conduct light in a wire.
• Telescopes detect light from long distance.
• LEDs produce light that is detected at a long distance.
• Doppler radar uses light in the form of radio waves to broadcast a location.