Presentation on theme: "Aim: How can we explain the Electromagnetic Spectrum?"— Presentation transcript:
1Aim: 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
2The 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
5Long Radio Waves Gamma Rays What type of wave has the longest wavelength?What type of wave has the shortest wavelength?Long Radio WavesGamma Rays
6About what is the wavelength of visible light? 10-7 m
7Gamma Rays Long Radio Waves What type of wave has the highest frequency?What type of wave has the lowest frequency?Gamma RaysLong Radio Waves
8Visible light only makes up about 2% of the EM spectrum!
9What 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
10In 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
11Finding 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
12Determine 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)
13When asked to refer to a specific color’s frequency, choose the value to the LEFT of that color!
14What is the wavelength of red light? c = fλ3 x 108 m/s = (4.82 x 1014 Hz) λλ = 6.2 x 10-7 m
15Calculate 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
16In a vacuum, all electromagnetic waves have the same WavelengthFrequencySpeedamplitude
17A 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
18How long does it take light to travel from the Sun to the Earth?