Chapter 18 - Electromagnetic Waves

Front

What is an electromagnetic wave?

Back

An electromagnetic wave is a wave that consists of oscillating electric and magnetic fields and travels through space at the speed of light.

Front

What is the speed of light in a vacuum?

Back

The speed of light in a vacuum is approximately 299,792 kilometers per second (km/s).

Front

What happens to the speed of light when it enters a denser medium?

Back

The speed of light decreases when it enters a denser medium.

Front

What is refraction?

Back

Refraction is the bending of light as it passes from one medium to another due to a change in its speed.

Front

What is polarization of light?

Back

Polarization of light is the process by which light waves are restricted to vibrate in a particular direction.

Front

What are the different types of electromagnetic waves?

Back

The different types of electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

Which electromagnetic wave has the highest energy?

Back

Gamma rays have the highest energy among electromagnetic waves.

Front

What is the relationship between wavelength and frequency?

Back

Wavelength and frequency are inversely related; as the wavelength increases, the frequency decreases, and vice versa.

Front

What is the visible spectrum?

Back

The visible spectrum is the portion of the electromagnetic spectrum that can be seen by the human eye, ranging from approximately 400 nm (violet) to 700 nm (red).

Front

What color of light has the shortest wavelength?

Back

Violet light has the shortest wavelength in the visible spectrum.