What are the three ways materials can be classified?
Transparent, translucent, and opaque
100
What is refraction?
The bending of light waves due to a change in speed.
100
Radio waves have the ____ wavelengths and _____ frequencies.
Radio waves have the LONGEST wavelengths and LOWEST frequencies.
100
What is the Electromagnetic spectrum?
The complete range of electromagnetic waves placed in order of increasing frequency(and wavelength).
100
The image formed on the retina is ______.
Upside-down
200
What does an opaque material do?
Reflect or absorb all the light that hits it.
200
When light enters a medium, why does it bend?
The speed changes/slows down.
200
Why can gamma rays kill cancer cells?
They are the most penetrating.
200
What waves have the shortest frequency and shortest wavelengths?
Gamma Rays
200
What does the cornea do? (2 things)
1. Protect the eye
2. Act as a lens to focus light rays.
300
Which of the following is an example of translucence?
1) Pottery
2) A glass door
3) Fog
4) Nutella
3; fog
300
What can cause refraction, other than a change in speed?
Different densities in a medium
300
Which of the following can be a possible wavelength for visible light?
1) 700 nM
2) 300 nM
3) 900 nM
4) None of the above
1; 700nM
300
What does UV stand for?
Ultraviolet
300
List two physical properties of the cornea.
1. Clear
2. Transparent
400
What would an object seen through a translucent material look like?
You would be able to see the object, but the details would be blurred.
400
Why do stars twinkle?
Because of the variations in the density of the Earth's atmosphere.
400
List ALL the uses of microwaves. (The light waves, not the ovens for heating food.)
Cell phone communication, radar systems, and microwave ovens
400
What are the waves of the Electromagnetic Spectrum in order from longest wavelength and lowest frequency to shortest wavelength and shortest frequency?
Radio waves, Microwaves, Infrared rays, Ultraviolet rays, X-rays, and Gamma rays.
400
What is the purpose of the cornea's bending the light?
So that the light can travel freely through the pupil.
500
If a transparent material has imperfections, it can _____ light.
Scatter
500
Why does the air over a fire cause objects to shimmer?
The path of the light isn't straight.
500
Small doses of UV rays can allow your skin to produce _____, but too much can cause _______ damage and ____ cancer.
Small doses of UV rays can allow your skin to produce VITAMIN D, but too much can cause EYE damage and SKIN cancer.
500
What two rays is visible in between?
Infrared and Ultraviolet.
500
What further focuses the light so that it shines on the retina?