4.3 Electromagnetic Spectrum

Do EM waves need a medium to travel?

no

All EM waves travel at the speed of __ (3 × 10^__ m/s)

light, 8

Radio waves have the:
__ freq, __ energy, __ λ

lowest, lowest, highest

Gamma rays have the:
__ freq, __ energy, __ λ

highest, highest, lowest

R__ Waves
Uses: r__, T__, RFID, astronomy
Excessive exposure: incr heating

radio, radio, TV

M__
Uses: s__ T__, m__
Excessive exposure: internal heating

microwaves, satellite TV, microwaves

i__
Uses: t__ images, e__ grills, TV r__, intruder alarms
Excessive exposure: burns skin

infrared, thermal, electric, remotes

V__ L__
Uses: v__, i__, photography
Excessive exposure: N/A

visible light, vision, illumination

U__
Uses: s__ water, detecting fake b__ notes
Excessive exposure: damages surface cells & eyes = skin cancer

ultraviolet, sterilising, bank

X__
Uses: medical s__, s__ scanning
Excessive exposure: mutation/damage to cells in body

xray, scan, security

G__ rays
Uses: s__ food & medical e__, detects c__
Excessive exposure: mutation/damage to cells in body

gamma, sterilises, equipment, cancer