Front

What are electromagnetic waves?

Back

Electromagnetic waves are waves that can travel through a vacuum and do not require a medium. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

What is the longest type of electromagnetic wave?

Back

Radio waves are the longest type of electromagnetic waves.

Front

What is refraction?

Back

Refraction is the bending of light waves as they pass from one medium to another, caused by a change in their speed.

Front

What is reflection?

Back

Reflection is the bouncing back of light waves when they hit a surface.

Front

What is diffraction?

Back

Diffraction is the bending of waves around obstacles or through openings.

Front

What is absorption in terms of light?

Back

Absorption is the process by which light waves are taken in by a material, converting the light energy into other forms of energy.

Front

What type of wave requires a medium to travel?

Back

Sound waves require a medium (like air, water, or solids) to travel.

Front

What happens to light when it enters water from air?

Back

The light undergoes refraction and bends towards the normal line.

Front

Why does an apple appear red?

Back

An apple appears red because it reflects red light and absorbs all other visible wavelengths.

Front

What is the normal line in optics?

Back

The normal line is an imaginary line perpendicular to the surface at the point of incidence where light waves strike.