Chapter 7: Electromagnetic Waves

Question 1

What are the main groupings of the electromagnetic spectrum? List in ascending order of frequency.

Answer 1

Radio waves, Microwaves, Infrared, Visible, Ultraviolet, X-rays, Gamma rays

Question 2

What is the relationship between wavelength and frequency?

Answer 2

The higher the frequency, the shorter the wavelength (Iversely proportional)

Question 3

What is the relationship between frequency and energy?

Answer 3

The higher the frequency, the higher the energy (directly proportional)

Question 4

What is the equation linking energy and frequency?

Answer 4

Energy = Planck’s constant x frequency

Question 5

What are some usages of radio waves?

Answer 5

Radio telescopes, Wireless Radio Transmission

Question 6

What are some usages of microwaves?

Answer 6

Mobile phone signal, Microwave ovens

Question 7

What are some usages of infrared?

Answer 7

Thermal imaging, Physiotherapy

Question 8

What are some usages of ultraviolet rays?

Answer 8

Treatment of skin conditions, Security markings

Question 9

What are some usages of X-rays?

Answer 9

X-ray imaging, Scanning airport luggages

Question 10

What are some usages of gamma rays?

Answer 10

Radioactive tracing, Sterlising medical equipment