Sources of Light

Flashcards reviewing Hitler's expansionist plans and different sources of light.

Mistake

Mistake

What are luminous objects?

Objects that produce light; essential for vision in the dark.

What is incandescence?

Light produced by heating metal, like a filament in a bulb.

Why is incandescence considered inefficient?

Due to heat loss.

What is electric discharge?

Light produced from electricity passing through gas, as seen in neon signs.

What is fluorescence?

Light emitted during exposure to UV light, used in classrooms and office lights.

What is a key advantage of fluorescence lighting?

Energy efficient and cool to the touch.

What is phosphorescence?

Light emitted slowly after UV exposure ends, seen in glow-in-the-dark materials.

How does phosphorescence work?

Electrons store and release energy gradually.

What is chemiluminescence?

Light from a chemical reaction, with no heat involved, used in glow sticks.

Give examples of bioluminescence.

Light produced by living organisms like fireflies, jellyfish, and some fungi that is used for attraction, camo, or communication.

What is triboluminescence?

Light from friction or breaking crystals, seen when rubbing or crushing quartz.

What is a light-emitting diode (LED)?

Light moving from a semiconductor; very energy efficient and durable.

What is electroluminescence?

Light from electrical current in a material; no heat or filament required.

What is organic light-emitting diode (OLED)?

Light from organic compounds under voltage, used in smartphones and TVs.

What are plasma displays?

Light from ionized gas particles in a screen, used in large flat-screen TVs, and now replaced by LED or OLED.

What are some characteristics of laser light?

Intense, focused, single-wavelength, highly directional and powerful beam used in surgery and cutting tools.

What are Non-Luminous object?

Objects that don't emit their own light and are usable only when they reflect light.