chapter 13 - em waves

Question 1

list em waves from shortest wavelength to longest wavelength

Answer 1

gamma rays
xray
ultraviolet
visible light
infrared
microwave
radiowaves

Question 2

gamma rays

Answer 2

to kill cancer cells during treatment

Question 3

x-rays

Answer 3

medical radiology, security screening and industrial defect detection

Question 4

ultraviolet

Answer 4

sun-beds, bank note authentication, disinfection of water

Question 5

visible light

Answer 5

photography, optical fibres in medicine and telecommunications

Question 6

infrared

Answer 6

remote controllers, intruder alarms and thermal imaging

Question 7

microwaves

Answer 7

mobile phones, microwave oven, satellite television

Question 8

radio waves

Answer 8

radio and television communication, astronomy and RFID tags

Question 9

properties of em waves

Answer 9

• all EM waves are transverse waves
• all EM waves can travel without a medium, with the same speed of 3.0x10⁸ m/s in a vacuum
• the wave speed equation, v = frequency x wavelength applies to all EM waves
• EM waves transfer energy
• EM waves undergo reflections and refractions