EM weather considerations
What affect does the ionosphere have on em signals.
Causes satellite signals to be interfered with, causing disruptions and breaks in signals.
Violet, Indigo, Blue, Green, Yellow, Orange, Red
What are E fields and B fields?
Electric fields and magnetic fields.
What is frequency?
number of cycles per second, defined as Hertz per second.
What is absorption?
What causes atmospheric scattering and refractions?
Differences in atmospheric density and temperature cause light to refract and scatter when going through it.
What type of waves of the EM spectrum do radios use?
What is an electric field?
A force field around a harged objetct that illustrates the direction of electric force, measurable effect generate by any charged object.
What is the relationship between wavelength and frequency?
the shorter the wavelength, the greater the frequency (inversely proportional)
What is interference?
EM waves can move through other waves, which means they can interact with each other as they pass through the same place at the same time.
What is scintillation?
Variations in strength, position, and polarization of transmitted signals passing through a medium.
What is RF propagation?
The 300kz-3mhz range curves itself around the curvature of the earth.
What is EM Radiation?
What is the relationship between energy and frequency?
- the greater the frequency, the higher the energy (directly proportional)
- E=hv ('h' is constant which describe the behavior of particles and waves on the atomic scale.
Convert 11001001 to a number
201
What type of waves are completely visible from earth?
Radio waves.
What are the 7 parts of the EM spectrum?
Radio waves, microwaves, infrared, visible light, UV rays, x-rays, gamma waves
What are some properties of photons?
No mass, elementary particles, have no electric charge, are stable, carry energy and momentum which are dependent on the frequency. Can have interactions with other particles at the speed of light.
What is a period?
the total time which a wave takes to travel 1 wavelength.
Convert 61dB to W.
32 W
What area of the earth is most effected by scintillation?
Places closest to the equator
What are the 8 types of frequencies of the radio spectrum?
VLF, LF, MF, HF, VHF, UHF, SHF, EHF.
What is the wave particle duality theory?
Light has properties of both waves, and particles.
What is the amplitude:
measures the wave from the zero point on an x-axis to the top of the highest point of the wave.
Convert 500000000W into dB
Around 84W