Ms Lim's Cheat Sheet : Electromagnetic Waves

Question 1

What is in the electromagnetic spectrum?

Answer 1

Radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays.

Question 2

Which electromagnetic radiation has the longest wavelength, lowest frequency and lowest energy?

Answer 2

Radio waves.

Question 3

Which electromagnetic radiation has the shortest wavelength, highest frequency and highest energy?

Answer 3

Gamma rays.

Question 4

How are electromagnetic waves different from sound?

Answer 4

• Electromagnetic waves are transverse waves while sound waves are longitudinal waves.
• Electromagnetic waves do not need a medium to transfer energy but sound wave requires a medium to transmit.
• The speed of electromagnetic waves in 3 x 10^8 m/s in air while the speed of sound waves is 330 m/s in air.