Electromagnetic Spectrum
Which has a longer wavelength: infrared or ultraviolet?
Infrared
What are the primary colors of light?
Red, Green, and Blue
What kind of reflection occurs on a rough surface, spectral or diffuse?
Diffuse
What is the term for when light bends as it enters a new medium?
Refraction
What law explains how brightness decreases with distance?
Inverse Square Law
Which part of the EM spectrum has the highest frequency?
Gamma Rays
Why does a green leaf appear green?
What is the name of the line perpendicular to a mirror’s surface?
Normal
What happens to light rays after passing through a concave lens?
They diverge.
Is there anything in the universe that travels faster than light?
No
Which part of the EM spectrum has the lowest energy?
Radio Waves
What happens when white light passes through a blue filter?
All colors except blue are absorbed.
If you stand 5 feet away from a plane mirror, how far inside the mirror does you image appear to be?
What is the total distance between you and your image?
5 feet.
10 feet.
What type of lens causes light to converge? What is the name of the area where the light converges?
Convex Lens
Focal Point
Describe the difference between a real image and virtual image.
Real images occur when light actually converges in real life. Virtual images occur when light does not actually converge in real life.
How does the speed of a radio wave compare to the speed of a gamma ray?
They are equal.
We have receptors in our eyes that detect red, green, and blue light. If you eyes detect all three of these colors, what color do you see?
White
Describe the image as:
Real or virtual?
Upright or Inverted?
Magnified or Reduced?
Real
Inverted
Reduced
Describe the image as:
Real or virtual?
Upright or Inverted?
Magnified or Reduced?
Concave or convex lens?
Converging or diverging lens?
Real
Inverted
Magnified
Convex
Converging
Light can knock electrons from their ground state to their excited state. Does this show the wave or particle nature of light?
Particle
What does the energy of a photon depend on?
Frequency/Wavelength
Black. The blue object absorbs all colors except blue. If it absorbs the red light, it will appear black.
Describe the image as:
Real or virtual?
Upright or Inverted?
Magnified or Reduced?
Is the mirror a concave or convex mirror?
Is the mirror a converging or diverging mirror?
Virtual
Upright
Reduced
Convex
Diverging
Describe what is happening in the picture. Use vocabulary from this unit in your description.
The light converges too soon. A concave/diverging lens causes the rays to spread out so they converge later, on the retina, allowing the person to see.
Explain how light is produced at an atomic level.
Electrons are excited by gaining energy and move up energy levels. they fall back to their ground state by releasing energy in the form of light.