Electromagnetic Waves: Properties, Types, and Applications, Slides of Environmental science

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PRAYER

◼ Human stomach acid is typically 1.0 to 2.0, meaning that it has an incredibly strong pH. In a study published in the journal Gastrointestinal Endoscopy, scientists found that the “thickened back of a single-edged blade” dissolved after two hours of immersion in stomach acid.

Electromagnetic waves

◼ Produced by the movement of electrically charged particles ◼ Can travel in a “vacuum” (they do NOT need a medium) ◼ Travel at the speed of light ◼ Also known as EM waves

Light, microwave, x-ray, TV, and cell phone

transmission are all kinds of

ELECTROMAGNETIC WAVES.

Electromagnetic waves are a group of energy waves that are mostly invisible and can travel through empty space. These energies bombard our bodies all day long, but we are only aware of a very small portion of them: visible light (colors), infrared light (heat), and ultraviolet (sunburn).

Electromagnetic energy is created by

vibrations that produce waves.

Each electromagnetic wave emits a different level of energy. These energies travel silently at the speed of light and produce a “signature” wave – with a unique range of length, energy, and frequency – that scientists can identify and measure.

We can measure the energy of an

electromagnetic wave by measuring its

FREQUENCY.

Frequency refers to the number of waves a vibration creates during a period of time. In general, the higher the frequency, or number of waves, the greater the energy of the radiation.

MICROWAVES

◼ Wavelengths from 1 mm- 1 m ◼ Uses:  Microwave ovens  Bluetooth headsets  Broadband Wireless Internet  Radar  GPS

MICROWAVES are widely used to quickly heat up food. Microwaves are also referred to as range of waves in the electromagnetic spectrum with a specific wavelength and frequency.

INFRARED RADIATION

◼ Wavelengths in between microwaves and visible light ◼ Uses:  Night vision goggles  Remote controls  Heat-seeking missiles

Another popular group of waves from the

electromagnetic spectrum involves

INFRARED.

INFRARED RADIATION is a type of electromagnetic radiation that involves heat, or thermal radiation. All objects emit (give out) and absorb (take in) thermal radiation.

When we use the term “light”, we are referring

to a group of electromagnetic waves called

VISIBLE LIGHT.

Each individual wavelength within the spectrum of visible light wavelength represents a particular COLOR. When light of that particular wavelength strikes our eye, we perceive that specific color sensation.

ULTRAVIOLET ◼ Shorter wavelengths than visible light ◼ Uses:  Black lights  Security images on money  Harmful to living things ◼ Used to sterilize medical equipment ◼ Too much causes sun burn ◼ Extremely high exposure can cause skin cancer