EM Spectrum

Question 1

List the order of the EM spectrum

Answer 1

Radio waves → Microwaves → Infrared → Visible → UV (ultraviolet) → X-rays → Gamma rays

Question 2

List the order of the colours of the visible spectrum (rainbow)

Answer 2

Red, orange, yellow, green, blue, indigo, violet

Question 3

Identify three ionising radiations

Answer 3

UV, X - rays, gamma rays

Question 4

Describe the uses of different EM radiation

Answer 4

• Radio waves : TV and radio
• Microwaves : Mobile phones and cooking
• Infrared : Cooking (e.g. oven), heating,
  Bluetooth, Thermal imaging
• Visible light : Photosynthesis
• UV : Sterilising water, detecting forged bank notes
• X rays : Airport security, medical scans
• Gamma : Sterilising surgical equipment , destroying cancer
  cells