Presentation on theme: "Aim: How can we explain the Electromagnetic Spectrum?"— Presentation transcript:
1 Aim: How can we explain the Electromagnetic Spectrum? Do Now:A light wave in a vacuum is traveling with a frequency of 6.2 x 1010 Hz. What is the wavelength?v = fλ3.0 x 108 m/s = (6.2 x 1010 Hz)λλ = 4.8 x 10-3 m
2 The Electromagnetic Spectrum The speed of all waves of the EM spectrum in a vacuum is the speed of light (c).= 3.00 x 108 m/s
5 Long Radio Waves Gamma Rays What type of wave has the longest wavelength?What type of wave has the shortest wavelength?Long Radio WavesGamma Rays
6 About what is the wavelength of visible light? 10-7 m
7 Gamma Rays Long Radio Waves What type of wave has the highest frequency?What type of wave has the lowest frequency?Gamma RaysLong Radio Waves
8 Visible light only makes up about 2% of the EM spectrum!
9 What color light has a frequency between 6. 10 x 1014 Hz and 5 What color light has a frequency between 6.10 x 1014 Hz and 5.20 x 1014 Hz?What color light has a frequency between 5.03 x 1014 Hz and 4.82 x 1014 Hz?GREENORANGE
10 In a vacuum, a monochromatic beam of light has a frequency of 6 In a vacuum, a monochromatic beam of light has a frequency of 6.3 x 1014 Hz. What color is the light?BLUE
11 Finding Frequency or Wavelength of an Electromagnetic Wave Use the equationv = fλJust remember that any EM wave has a velocity of….3.00 x 108 m/sHence, c = fλ
12 Determine the color of a ray of light with a wavelength of 6 Determine the color of a ray of light with a wavelength of 6.21 x 10-7 m.c = fλ(3.00 x 108 m/s) = f(6.21 x 10-7 m)f = 4.83 x 1014 Hz(ORANGE)
13 When asked to refer to a specific color’s frequency, choose the value to the LEFT of that color!
14 What is the wavelength of red light? c = fλ3 x 108 m/s = (4.82 x 1014 Hz) λλ = 6.2 x 10-7 m
15 Calculate the wavelength of WPLJ (95.5 fm) c = fλHint: fm radio transmits in megahertz(3.00 x 108 m/s) = (95.5 x 106 Hz) λλ = 3.14 m
16 In a vacuum, all electromagnetic waves have the same WavelengthFrequencySpeedamplitude
17 A 2. 00 x 106 Hz radio signal is sent a distance of 7 A 2.00 x 106 Hz radio signal is sent a distance of 7.30 x 1010 meters from Earth to a spaceship orbiting Mars. Approximately how much time does it take the radio signal to travel from Earth to the spaceship?4.11 x 10-3 s2.43 x 102 s2.19 x 108 s1.46 x 1017 s
18 How long does it take light to travel from the Sun to the Earth?