electromagnetic waves chapter 17 section 1-2 pages 532-547
TRANSCRIPT
What are electromagnetic waves?
Special kind of transverse wave Does NOT need to pass through a medium
Can travel through empty space
What are electromagnetic waves?
Velocity in empty space = 300,000,000 m/sLow wavelength and High frequencyHigh wavelength and Low frequencyYou can use v = λ • f
Wavelengths can be arranged into a spectrum Frequency relates to the amount of energy
What is the electromagnetic spectrum?
A – Radio Waves Large wavelength, low frequency Low energy Used for AM radio, short wave radio, FM radio,
cell phone, cordless phone, TV, radar, microwave Microwaves are high energy radio waves
What is the electromagnetic spectrum?
B – Infrared Radiation Heat radiation – warm objects give off more radiation Thermogram – used to see heat radiation in body, can help
locate tumors which give off more heat radiation Night vision goggles – use infrared radiation to detect
targets
What is the electromagnetic spectrum?
C – Visible Radiation = Light Smallest range of the E.M. spectrum The only part of the E.M. spectrum we can see White light can be broken down into a color spectrum by
using a prism ROY G. BIV RedRed, , OrangeOrange, , YellowYellow, , GreenGreen, , BlueBlue, , IndigoIndigo, , VioletViolet
What is the electromagnetic spectrum?
C – Visible Radiation = Light Photosynthesis – plants use light energy in order to
create their own food Human eye – chemical reactions in eye that let you
see are stimulated by light
What is the electromagnetic spectrum?
D – Ultraviolet Radiation (UV) UV rays help skin cells produce vitamin D for
healthy bones and teeth But too much UV radiation kills healthy cells UV radiation can lead to dry, sagging skin, even
skin cancer
What is the electromagnetic spectrum?
D – Ultraviolet Radiation (UV) Earth’s atmosphere – ozone layer (O3) deflects
harmful UV rays from Earth Chlorofluorocarbons destroy ozone molecules and
reduces Earth’s defense against UV rays
What is the electromagnetic spectrum?
E – X-Rays X-Rays contain more energy and penetrate more easily X-Rays pass through skin and muscle, but are absorbed by
dense bone matter and can be used to take a “picture” of bones
Too much exposure to X-Ray radiation can be harmful
What is the electromagnetic spectrum?
F – Gamma Rays Highest frequency in the E.M. spectrum Have the most energy, can penetrate most things Emitted from the nuclei of radioactive atoms, also
can be received from space Used to kill cancer cells during radiation therapy,
but healthy cells are often killed or damaged too
What is the electromagnetic spectrum?
Which is true? A. high wavelength high energyB. high frequency high energy
What is the electromagnetic spectrum?
X-Rays have less energy than….A. Radio WavesB. InfraredC. Visible LightF. Gamma Rays
What is the electromagnetic spectrum?
Which is the smallest part of the electromagnetic spectrum? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which is the smallest part of the electromagnetic spectrum?
C. Visible Light
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum has the smallest wavelength? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum has the smallest wavelength?
F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum has the smallest frequency? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum has the smallest frequency? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum is used to detect broken bones? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum is used to detect broken bones? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum is also known as heat radiation? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum is also known as heat radiation? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum is needed for healthy bones, but only in small quantities? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
Which part of the electromagnetic spectrum is needed for healthy bones, but only in small quantities? A. Radio Waves B. Infrared Radiation C. Visible Light D. Ultraviolet Radiation E. X-Rays F. Gamma Rays
What is the electromagnetic spectrum?
High frequency Radio Waves are known as….A. Short wavesB. Gamma raysC. Visible lightD. Microwaves
What is the electromagnetic spectrum?
High frequency Radio Waves are known as….A. Short wavesB. Gamma raysC. Visible lightD. Microwaves