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Light Physics
learn about light
Question | Answer |
---|---|
what is the speed of light( in a vacuum)? | 299,800,000 m/s |
"Light is an electromagnetic wave" What does this statement mean ? | This means it makes waves that are perpendicular to each other. |
What is the name of type of light we see? | Visible |
The reason we can't see some colors. | They are absorbed |
What is refraction ? | when light changes speed and is distorted |
Ultraviolet light | can cause cancer, and kill germs |
What is wavelength (frequency) measured in ? | Hertz |
What is does reflection do ? | light bounces off of surfaces at the same angle it meets the surface. |
Amplitude | the measure of a wave from the crest to the trough or baseline. |
What controls brightness of a light wave? | Amplitude |
What controls the color of a light wave? | frequency |
The colors of the electromagnetic spectrum from strongest to weakest | radio, microwaves, infrared, visible, ultraviolet, x-ray, gamma |
crest | the top of a wave |
trough | the bottom of a wave |
baseline | the middle part of a wave (no energy) |
wavelength | the distance from crest to crest |
frequency | the number of waves that occur in a second (hertz) |
visible spectrum | red, orange, yellow, green, blue, indigo, violet |
radio waves | used for communication like cellular and television |
microwaves | use to warm things up |
infrared | used in night vision and remote controls |
photon | a particle of light that behaves like energy and like matter. |
x-ray | used to see inside of things |
gamma | high energy wave that can instantly kill |