Light and optics

Light is a form of ___________ that travels in waves.

• matter

• gas

• heat

• energy

What is the only part of the electromagnetic spectrum we can see?

• UV light

• X-rays

• Visible light

• Microwaves

Order the colors of visible light in order from lowest energy (longest wavelngth) to highest energy (smallest wavelength):

• Red, orange, yellow, green, blue, indigo, violet

• Violet, indigo, blue, green, yellow, orange, red

• Green, blue, orange, red, violet, indigo, yellow

• Indigo, yellow, red, violet, green, blue, orange

Which of the following has the highest energy (shortest wavelength)?

• Radio waves

• Gamma rays

• Visible light

• Infrared light

T/F: Luminous objects produce & emit light

• True

• False

Light emitted from a heated material is

• Incandescence

• Luminescence

• Flourescence

• Phosphorescence

Which type of light bulb is more efficient?

• Incandescent

• Flourescent

T/F: Luminescence is light given off by an object that has NOT been heated

• True

• False

A plant looks green because

• Green is being absorbed by the plant

• Green is being reflected by the plant

We can see the color black because

• The color black is absorbed by the black object

• The color black is reflected by the black object

• The black object reflects all the colors of the visible light spectrum

• The black object absorbs all the colors of the visible light spectrum