(SCI) EM Spectrum

• Electromagnetic waves are waves that are created as a result of vibrations between an electric field and magnetic field
• Electromagnetic waves are produced by vibrating change.
• Red and violet are the two colors of light which lie at the beginning and end of the visible spectrum.
• Radio wave is a type of EM which has a wavelength similar to the size of a PBA basketball court (28 m).
• X-ray has the LEAST wavelength range.
• The frequency of electromagnetic waves decreases, if its wavelength increases.
• Radio waves have the WIDEST wavelength range.
• The color red has the LONGEST wavelength in the visible spectrum.
• The property, wavelength, spells the difference between infrared and ultraviolet radiation.
• Radio waves can travel the FARTHEST distances because it has a wavelength range of greater than 1x10^-1 meters.
• Among gamma rays, infrared, UV, and visible light... infrared has the LOWEST frequency.
• Among infrared, microwave, radio wave, and x-ray, which has the shortest wavelength?

  X-ray
• Among microwave, radio wave, UV, and visible lights, which carries MOST energy?

  UV
• Gamma ray has the highest frequency and the highest energy.
• A wave is a disturbance in space.
• The crest is the highest point in a wave.
• The trough is the lowest point in a wave.
• Amplitude is the distance from the midpoint to the highest (or lowest) point of a wave.
• Wavelength refers to the distance between two successive identical parts of a wave.
• Frequency refers to the number of waves produced in one second.
• Range refers to the extent or the limits between which variation is possible.
• The infrared wave was discovered by famous astronomer Sir Frederick William Herschel and has a range of 7x10^-7 m - 1x10^-5 m.
• A visible light has a frequency of 6.3 x 1014 Hz. Meaning, that blue is the color of light.
• Microwaves make cellular telephones transmit and receive signals.
• Infrared wave is used in night vision goggles.
• Visible spectrum is the kind of EM wave which makes use of artificial lighting.
• UV radiation can be used to identify original from fake banknotes.
• Only short wavelength X-rays can be used to penetrate even through metals.
• Microwaves are used in RADAR.
• Gamma rays are emitted by stars and some radioactive substances.
• UV waves causes the fluorescent chemicals to glow in sunlight.
• Only 1 out of the 7 EM waves are visible.
• The speed of an EM wave must be 3 x 10^8 m/s
• AMPERE: Magnetic effect based on direction of current.
• FARADAY: Electromagnetic induction
• HERTZ: EM waves and light
• MAXWELL: Developed equations that showed the relationship between electricity and magnetism
• OERSTED: Wire = Magnet