Electromagnetic waves
What is the speed of electromagnetic waves in a vacuum? (with unit)
3 x 10^8 meters per second.
What range of wavelengths does visible light cover?
400 to 760 nanometers.
_____ spreads light in different directions due to small particles in the medium.
Scattering
What happens to the frequency of an electromagnetic wave if its wavelength increases?
The frequency decreases.
What color of visible light has the longest wavelength?
Red
_____ occurs when the light bounces back into the same medium at the same angle it struck the surface.
Reflection
Which has a shorter wavelength: visible light or radio waves?
Visible light.
What color of visible light has the shortest wave length?
Violet
_____ occurs when light’s energy is absorbed by a material, often turning into heat.
Absorption of light
E = hf
E - energy
h - Planck's constant
f- frequency
What color was considered a separate color, but in modern usage is often omitted?
Indigo
_____ happens when light passes through a material with little or no absorption, allowing it to continue through.
Why can light travel through space, but sound cannot?
Light can travel through space because it doesn't require a medium, while sound needs a medium like air or water to travel.
The energy of light is directly related to its frequency, which the number of wave cycles that pass a point in ________ second.
One
When light hits a surface, it can be _____, _____, _____, _____, or _____.
Scattered, reflected, refracted, absorbed, or transmitted