Do Now (3 mins): Normal Form Standard Form 9300000 a) 0.00008066 b) c) 7.78 x 105 d) 1.115 x 10-6 0.00749 e) 4259 f) g) 6.25 x 1018 h) 1.6 x 10-19

Absence Moodle (and HWK Answers)

SHOW ALL WORKING Calculate the wavelength of a wave with 200 MHz frequency travelling at 0.02 ms-1. Calculate the frequency of a wave 12 nm long travelling 90.0 cm in one minute. Calculate the wave speed of a wave which takes two minutes to travel 440 um.

Prefix multipliers Power Prefix Symbol 109 giga G 106 mega M 103 kilo 10-3 milli m 10-6 micro μ 10-9 nano n 10-12 pico P * 10-2 centi c

Question “One of the most important scientific advances of the last 200 years is the discovery and application of ________________”

Electromagnetic Waves Electromagnetic waves are made up of oscillating electric and magnetic fields. All electromagnetic waves travel at the speed of light, c, in a vacuum. c = speed of light = 3.0 x 108 ms-1 Electromagnetic waves do not require medium to travel.

Radio Wave f = 3 kHz ~ 300 MHz λ = 100 km ~ 1 m

Micro Wave f = 300 MHz ~ 300 GHz λ = 1 m ~ 1 mm

Infrared f = 300 GHz ~ 400 THz λ = 1 mm ~ 750 nm

Visible Light f = 400 THz ~ 770 THz λ = 750 nm ~ 390 nm

Ultra violet (UV) f = 770 THz ~ 30 PHz λ = 390 nm ~ 10 nm

X-ray f = 30 PHz ~ 30 EHz λ = 10 nm ~ 0.01 nm

Gamma ray f = higher than 30 EHz λ = shorter than 0.01 nm

Electromagnetic Waves Electromagnetic waves are made up of oscillating electric and magnetic fields. All electromagnetic waves travel at the speed of light, c, in a vacuum. c = speed of light = 3.0 x 108 ms-1 Electromagnetic waves do not require medium (particles to transfer energy).