Electromagnetic Waves Flashcards
We measure the magnitudes of the electric field and magnetic field at a given instant and at a given point in an electromagnetic wave. How are the magnitudes related to the speed of light?
The ratio of the electric field magnitude to the magnetic field magnitude is equal to the speed of light.
Which produces the magnetic field in an electromagnetic wave?
the changing of the electric field with time along a perpendicular direction
Which produces the electric field in an electromagnetic wave?
the changing of the magnetic field with time along a perpendicular direction
Which vector statement gives the direction of travel of an electromagnetic wave?
The cross product of the electric field crossed into the magnetic field.
When unpolarized light is incident on a polarizing sheet, what fraction of the intensity is transmitted by the sheet?
50%
When POLARIZED light is incident on a polarizing sheet, what fraction of the intensity is transmitted by the sheet?
depends on orientation of the polarizing axis of the sheet
Which is true about the transmission of the electric fields of light by a polarizing sheet?
Only the components parallel to the polarizing axis of the sheet are transmitted.
Which is true about reflection?
The angle of incidence is equal to the angle of reflection.
Which is true about refraction from one material into a second material with a greater index of refraction when the incident angle is, say, 30º?
The angle of refraction is less than the angle of incidence.
Which is true about refraction from one material into a second material with a smaller index of refraction when the incident angle is, say, 30º?
At the interface, the ray bends away from the normal.
