Light and the electromagnetic spectrum

Question 1

What type of waves are electromagnetic waves?

Answer 1

Transverse waves

Question 2

What are some examples of electromagnetic waves?

Answer 2

light, Radio waves, microwaves, anything on the Em spectrum

Question 3

What is visible light?

Answer 3

frequencies of light our eyes can detect

Question 4

Starting from the lowest colour of frequency what is the order of the colour spectrum?

Answer 4

low- Red, orange, yellow, green ,blue, indigo, violet -high

Question 5

list the order of the electromagnetic spectrum starting from the lowest frequency with the longest wavelength

Answer 5

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

Question 6

What are examples of long wave lengths and explain what they are used for?

Answer 6

infrared: used for communication over short distances and is used in thermal imaging

microwaves: used for communication and the transfer of energy to heat up food

Radio waves: used for communication over long distances and transmits radio broadcasts

Question 7

what are examples of short wave lengths and explain what they are used for

Answer 7

Ultra violet: used for the disinfection of water and is used for security (finding fingerprints)

x-rays: passes through many materials easily and is used in x-rays to gain images of inside the body

Gamma rays: used to kill cancer cells and to sterilise food and surgical equipment

Question 8

What are some EM dangers?

Answer 8

-too much infrared radiation can destroy cells and burn the skin

-Ultraviolet can damage DNA cells and cause cancer

-X-rays and gamma rays penetrate the body and cause mutations in DNA