Light Sources
A light that is produced by humans or human skill.
give an example of a light that gives off heat
sun, fire, fireworks...
True or False: Light waves travel in curved lines from the sun
FALSE: In straight lines from the sun
Light is __________
energy
Name an environmentally friendly way to make energy from light
solar panels
Light that occurs in nature without human input
Natural Light
give an example of a light source which does NOT give off heat
LED light bulbs, glow sticks
when light waves hit materials and stop (instead of travelling through or bouncing off)
Absorbtion
True or False: Life could survive on Earth without the sun.
False: Life on Earth requires energy from the sun.
True or False: Our sun is the only burning ball of gas we see in the sky
FALSE: All the stars we see are similar to our sun
Give 2 examples of natural light
sun, fire, moon, fireflies...
Why does our sun give off heat
It is a big fire, chemical reaction of the burning gases
When light waves hit an object and bounce off
Reflection
Light is made up of tiny particles called ___________
Photons
False
Give 2 examples of artificial light
flashlight, light bulb, fireworks, glow sticks...
If you are running a race in the desert, which colour shirt should you wear and why?
white - it absorbs less heat and you will want to stay cool in the desert
when light rays “bend” or change direction slightly
Refraction
The light produced by various living things
Bioluminescence
What are the scientific terms for materials which let light through and DO NOT let light through
transparent and opaque (translucent lets some light through)
Name 2 creatures that produce their own light in nature
firefly, glow worm, anglerfish, many other deep sea creatures
To absorb heat from the sunlight, which helps keep them warm
Name everyday examples of reflection and refraction
a mirror, a straw in your glass looks bent
Bioluminescence is THIS kind of reaction, inside of a living organism
Chemical reaction
Name the 2 types of wave lengths that humans cannot see with our naked eyes.
ultraviolet and infrared (x-ray, gamma ray, radio waves)