Question

The change in direction of an electromagnetic wave as it passes from one medium to another is called ...

Select one:

a. reflection

b. dispersion

c. refraction

d. polarization

Answer 1

Refraction is the change in direction of a wave passing from one medium to another caused by its change in speed. For example, waves in deep water travel faster than in shallow; if an ocean wave approaches a beach obliquely, the part of the wave farther from the beach will move faster than that closer in, and so the wave will swing around until it moves in a direction perpendicular to the shoreline. The speed of sound waves is greater in warm air than in cold; at night, air is cooled at the surface of a lake, and any sound that travels upward is refracted down by the higher layers of air that still remain warm. Thus, sounds, such as voices and music, can be heard much farther across water at night than in the daytime.

Answer 2

a. reflection

The electromagnetic wave outside and inside a medium are not the same. The wave inside a medium is affected by the charges that make up the material. For example, NaCl has slightly positive Na and slightly negative Cl atoms because of the distribution of electrons involved in the chemical bonding. When you apply an electric field (as exists with an electromagnetic wave) to these charged particles, they start to oscillate as they try to follow that field. Oscillating charges are accelerating, so according to Maxwell's equations, they must produce their own electric field.

Answer 3

c. refraction

Answer 4

here,

when the electromagnetic force travels from a mtdium to another

medium , the EM wave changes it's direction depending on the angle of

incidence and refractive indices of the mediums , this is called

REFRACTION

c.Refraction