sources of light

Question 1

what is natural light

Answer 1

light produced by the sun and stars

Question 2

what is artificial light

Answer 2

light produced through human technology

Question 3

phosphorescence is the ability to

Answer 3

store energy from a light source and then emit it slowly in the dark for some time afterward.

Question 4

incandescent light

Answer 4

light that is produced by an object, such as a metal, that is at a very temperature

Question 5

inside the incandescent light bulb is the..

Answer 5

filament (a very thin wire) through which electricity flows, heating it to a high temperature. only 5% of which is converted to light energy and the rest is heat.

Question 6

fluorescent light is

Answer 6

light emitted by some substance when they are exposed to electromagnetic radiation.

Question 7

a fluorescent light bulb is a glass tube filled with________________ like _____________

Answer 7

a small amount of gas, mercury vapor.

Question 8

the inside is coated with a powder called_______, which is a substance that glows after being exposed to ____________ particles.

Answer 8

phosphor, energized

Question 9

______________ use chemiluminescence, which is also used in_________________

Answer 9

glow sticks, crime scene investigation

Question 10

CSI’s use a chemical called _____________ to detect traces of blood because the chemical glows when reacts with ______ found in blood

Answer 10

luminal, iron

Question 11

what is triboluminescence

Answer 11

Triboluminescence, a process involving friction, is utilized by the Ute Aboriginal people in Utah and Colorado. some crystals can emit light when rubbed together or broken apart.

Question 12

_______ small devices made from semiconductor material, are efficient producers of light and emit little heat. They can operate using small amounts of electricity, making them ideal for electronic billboards, traffic lights, and automobile rear brake lights.

Answer 12

LED are

Question 13

OLED is …………

Answer 13

a flexible, thin, and energy-efficient display made of organic molecules, is versatile and can be used in various applications, including small screens and large screens, but is susceptible to water damage.

Question 14

LCD technology uses

Answer 14

a liquid crystal display (LCD) to display images. A white light shines behind a liquid crystal, which can change orientation when electricity is applied. Filters like red, green, and blue produce different colors, resulting in dark grey images.

Question 15

what is electric discharge?

Answer 15

it is a method for producing light in which an electric current passes through the air or another gas like neon. eg: lightening

Question 16

in plasma displays

Answer 16

each color is a tiny fluorescent light in which the electrical signals causes a gas like neon to release UV radiation. eg: large screen tvs