How can radio waves be described?
Radio waves are mechanical waves that must move through a medium.
Radio waves are mechanical waves that require no medium.
Radio waves are electromagnetic waves that require no medium.
Radio waves are electromagnetic waves that must move through a medium.
What is amplitude?
the maximum displacement from the midpoint between the crest and trough
the top of the wave
the horizontal distance the waves travels
the number of waves that pass a specific point in a specific time
What is the angle of incidence equal to when light is reflected?
an acute angle
the angle of reflection
the mode of interaction
the normal line
Why does the light from a flashlight appear brighter when you shine the light close to the object
than when you are far away?
because more light is absorbed by the air
because less light is absorbed by the air
because the light waves become refracted
because the light waves appear at their normal line