4.3

Question 1

Form of energy known as electromagnetic radiation. It travels as an electromagnetic wave and travels through the vacuum of space at 300,000 km/s.

Answer 1

Light

Question 2

Energy radiated in the form of a wave caused by an electric field interacting with a magnetic field. It is the result of the acceleration of charged particles and is categorized by wavelength and frequency.

Answer 2

Electromagnetic Radiation

Question 3

Measured as the distance from one peak of one wave to the next wave.

Answer 3

Wavelength

Question 4

Number of wave cycles per second. Expressed in units of hertz (Hz)

Answer 4

Frequency

Question 5

Sunlight striking the earth’s outer atmosphere is made up of about 5% ___________, 45% __________ _______, and 50% _________ _________

Answer 5

ultraviolet, visible light, infrared radiation

Question 6

It is the wavelengths of the electromagnetic radiation spectrum to which the human eye is sensitive.

Answer 6

Visible Light

Question 7

Part of the electromagnetic radiation spectrum which is capable of exciting the retina and ultimately producing a visual sensation. It is the wavelengths of electromagnetic radiation to which the eye is sensitive.

Answer 7

Visible light

Question 8

___________ is the amount of light incident (striking) on a surface.

Answer 8

Illuminance

Question 9

__________ is how bright an object appears.

Answer 9

Luminance

Question 10

It is the ratio of reflected light versus the light striking the surface.

Answer 10

Reflectance

Question 11

Occurs when light is reflected off a polished or mirror-like surface

Answer 11

Specular reflection

Question 12

It is the ratio of light transmitted through body to light illuminating surface.

Answer 12

Transmittance

Question 13

It is the ratio of light absorbed versus the light striking the surface.

Answer 13

Absorptance