Electromagnetic Rays
Christopher Card period 7
What is and Electromagnetic Rays?
Electromagnetic waves are waves which can travel through the vacuum of outer space.
Different terms used for Em (Electromagnetic Waves)
Wavelength Range-
"This "visible light" corresponds to a wavelength range of 400 - 700 nanometers (nm) and a color range of violet through red. The human eye is not capable of "seeing" radiation with wavelengths outside the visible spectrum"
Velocity in a Vacuum
"The velocity at which that happens is called Terminal velocity. Now, if the object is in vacuum (''a space entirely devoid of matter'') there are no molecules of air to collide with our object. The only force on the object (if placed in a gravitational field) is the gravitational force." The speed is 300,000,000 m/s.
Two types of waves
- Transverse Wave
- Longitudinal Wave
Here are some different ways EM waves are used throughout our days.
Broadcast Radio
The radio is a good example of an EM wave because, waves are transferred from a radio tower to your car or stereo antenna. Hinting at its name radio is what wave that are used during the transfer.
MRI
Magnetic Resonance Imaging (MRI) is a test that uses a magnetic field and pulses of radio wave energy to make pictures of organs and structures inside the body.
Television
The TV uses radio waves to transfer the picture and sound from you network carrier to your house.
Negative and Positive impacts about radio waves
: Pros -
They help us stay warm in the winter
These frequencies create radiation that is absorbed by the tissues in the body. When radio waves encounter living tissue, it begins to heat it up. (http://apecsec.org/10-important-facts-about-radio-waves/)
They keep us entertained
allowing us to transport music from a tower to your car or stereo. they also help delivering the picture on your TV when your watching cable or satellite.
They help us with medical procedures
used so there can be less intrusive surgery's and it can be used to help sleep apnea. the MRI used radio waves to see your organs.
: Cons -
skin cancer
if if used to much you may develop skin cancer.
Expensive
the cost is very high for test if needed.
very hazardous
you can get a certain amount of mri's done in a year or you will kill your internal organs.
How do Radio Waves work?
Radio waves video
This video is explaining what are radio waves on using everyday examples. it also explains how they work and somethings it may be used for. in a short 1:30 min video.