Presentation on theme: "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 10 10 Hz. What is the wavelength?"— Presentation transcript:
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 Hz. What is the wavelength? v = fλ 3.0 x 10 8 m/s = (6.2 x Hz)λ λ = 4.8 x m
The Electromagnetic Spectrum The speed of all waves of the EM spectrum in a vacuum is the speed of light (c). = 3.00 x 10 8 m/s
What type of wave has the longest wavelength? What type of wave has the shortest wavelength? Long Radio Waves Gamma Rays
About what is the wavelength of visible light? m
What type of wave has the highest frequency? What type of wave has the lowest frequency? Gamma Rays Long Radio Waves
Visible light only makes up about 2% of the EM spectrum!
What color light has a frequency between 6.10 x Hz and 5.20 x Hz? What color light has a frequency between 5.03 x Hz and 4.82 x Hz? GREEN ORANGE
In a vacuum, a monochromatic beam of light has a frequency of 6.3 x Hz. What color is the light? BLUE
Finding Frequency or Wavelength of an Electromagnetic Wave Use the equation v = fλ Just remember that any EM wave has a velocity of… x 10 8 m/s Hence, c = fλ
Determine the color of a ray of light with a wavelength of 6.21 x m. c = fλ (3.00 x 10 8 m/s) = f(6.21 x m) f = 4.83 x Hz (ORANGE)
When asked to refer to a specific color’s frequency, choose the value to the LEFT of that color!
What is the wavelength of red light? c = fλ 3 x 10 8 m/s = (4.82 x Hz) λ λ = 6.2 x m
Calculate the wavelength of WPLJ (95.5 fm) c = fλ Hint: fm radio transmits in megahertz (3.00 x 10 8 m/s) = (95.5 x 10 6 Hz) λ λ = 3.14 m
In a vacuum, all electromagnetic waves have the same (1)Wavelength (2)Frequency (3)Speed (4)amplitude
A 2.00 x 10 6 Hz radio signal is sent a distance of 7.30 x 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? (1)4.11 x s (2)2.43 x 10 2 s (3)2.19 x 10 8 s (4)1.46 x s
How long does it take light to travel from the Sun to the Earth?