The intensity of light is perceived by humans as _.

1
The intensity of light is perceived by humans as
_.

• brightness

2
What are the three reason we see colors?

• Light is transmitted
• Light is reflected
• Light is emitted

3
Your blue jeans appear blue because __.

• They reflect blue and absorb all other colors.

4
We see the light from sun because light is ___.

• Emitted

5
What are the three primary colors of light?

• Red
• Blue
• Green

6
What color of light will be made with the three
primary colors of light?

• White

7
What type of wave makes up light?

• Electromagnetic waves

8
Light waves travel fastest in __.

• Empty space

9
What portion of the light emitted by the Sun
reaches the Earth?

• Very small amount!

10
List at least 3 types of electromagnetic
radiation emitted by the sun.

• Ultraviolet radiation
• Visible light
• Infrared radiation

11
The unit used to measure frequency of a wave is
__ .

• Hertz

12
The intensity of a wave is a measure of the ___
of the wave.

• energy

13
What kind of electromagnetic wave can we see?

• Visible light

14
What will separate white light into the colors of
the rainbow?

• Prism
• Spectroscope

15
List the colors in order of longest wavelength to
shortest.

• Red orange yellow green
• Blue indigo violet

16
What type of waves are emitted by all warm bodies.

• Infrared

17
A nearsighted persons eyeball is too __.

• Long, so the focus is in front of the focal point.

18
What type of lens would correct nearsightedness?

• concave