Introduction to Electromagnetic Waves and the Electromagnetic Spectrum

The video tutorial explains electromagnetic waves, their properties, and uses across the spectrum. It covers the relationship between wavelength and frequency, and details the specific properties and applications of radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. The tutorial also highlights the potential risks of ionizing radiation and the importance of limiting exposure.

What is the speed of electromagnetic waves in a vacuum?

• 3.0 x 10^8 meters per second

• 2.0 x 10^8 meters per second

• 1.5 x 10^8 meters per second

• 4.0 x 10^8 meters per second

Which type of electromagnetic wave is used for satellite communications due to its low absorption by air molecules?

• Ultraviolet rays

• Infrared radiation

• Microwaves

• Radio waves

What is a common use of infrared radiation?

• Medical imaging

• Cooking food

• Fiber optic communications

• Tanning machines

Which part of the electromagnetic spectrum is visible to the human eye?

• Ultraviolet

• Gamma rays

• Infrared

• Visible light

Why should exposure to ultraviolet, X-rays, and gamma rays be limited?

• They are absorbed by water molecules

• They are ionizing and can damage living cells

• They are not visible to the human eye

• They can cause heating