The Question
 What are the different parts of the EM
spectrum?
 What is the speed of light?
 What is the wavelength, frequency and
energy of the different parts of the EM
spectrum?
 What is the Doppler Effect?
The Electromagnetic Spectrum
 Electromagnetic waves can move in a
vacuum.
 How does light get to us from earth?
 Through a vacuum known as space.
The Electromagnetic Spectrum
 Made up of 7 different parts.
 Start with Visible Light (this is the part of the EM
spectrum we can see.
 Visible Light is at the center.
 3 types of EM Waves on each side of visible light.
 ROYGBIV.
 Who is next to R?
 Who is next to V
Radio, Microwave, Infrared,
,Ultraviolet, Xray, Gammarays
The Electromagnetic Spectrum
You should be very afraid of HIGH ENERGY!!
EM Spectrum: Problem
 The speed of light in a vacuum is 300,000,000m/s.
 v=fll
 The wavelength of green light is .000000532m.
 What is the frequency of green light?
The Question
 What is the Doppler Effect?
The Doppler effect
https://www.youtube.com/watch?v=a3RfULw7a
AY
When Humans hear a sound wave they interpret
the frequency of the wave as “pitch”.
When an object making sound is not moving, the
frequency (pitch) will be the same to all
listeners.
The frequency (pitch) will not change.
The Doppler effect
https://www.youtube.com/watch?v=K
g9F5pN5tlI
https://www.youtube.com/watch?v=0r
JPvGML9A0
The Doppler effect
Doppler effect: A shift in frequency (and
wavelength) caused by an objects motion.
When the object making the sound is
moving, the frequency (pitch) will not be the
same to all listeners.
The frequency (pitch) will change.
This is true of all waves, not just sound
waves. Light (how we know how far stars are
from the earth), sound, water…
You hear the Doppler effect when you hear a
police siren coming toward you, then going
away from you.
The Answers

What is the Doppler Effect?

A shift in frequency that is caused by a
moving object.
The Answers
 What are the different parts of the
EM spectrum?
 There are 7 parts.
 Radio, Micro, Infrared,Visible,
Ultraviolet, Xray, Gammarays
The Answers
 What is the speed of light?
 300,000,000m/s
 What is the wavelength, frequency
and energy of the different parts of
the EM spectrum?
 Radio (low energy and frequency).
 Gamma (high energy and frequency).