What is Light? (lesson 2) Flashcards
Light is an
“electromagnetic wave”
Properties of
of light
Electromagnetic waves
in society
WHAT IS LIGHT
IS MADE UP OF ENERGY WAVES
PRODUCED WHEN ELECTRONS ARE “EXCITED”
WHY is light impotant?
allows for visibility
heats and warms earth
provides energy required for photosythesis
Properties of light-
Speed of light-
3.00 × 10 to the power of 8 m/s
vac
Properties of light-
Travels through a
vacuum
-does not require a medium (can travel without particles)
Properties of light-
linear propagation
travels is a straihgt line
Properties of light-
Reflection/Refraction
-bouncing of light off a surface
-bending of light when enters a new medium
the energy of light waves
VARY
Electromagnetic waves
light is made up of
waves
The energy of waves
VARY
Wavelength-
length of 1 wave
shorter waveslength have
longer =
higher energy
lower
Frequency
of waves per second
shorter wavelength (f)
higher frequency
more frequency more energy
visible light is within a
specific energy range
List the electromagnetic spectrum in order from the lowest energy to the highest energy waves.
radio waves, microwaves, infrared waves, visible light, ultraviolet, x-ray, and gamma rays
red, orange, yellow. green, blue, violet.
Light is made up of electromagnetic waves. What are the five (5) properties of light discussed
in class?
Linear Propagation
Speed of Light
Travels in a Vacuum
lions speak to rhinos everyday
Reflection/Refraction
Energy of Waves Varies
The energy of light may vary. List and describe the two (2) factors that affect the energy of
light?
Wavelength – the distance between two peaks in a wave (how long is the wave?)
Wave Frequency – the number of times a wave repeats itself in one (1) second
(how often does the wave occur?)
