Light Waves. Objectives: 1. Recognize that light has wave and particle characteristics 2. Relate energy of light to its frequency 3. Know the parts to the EM spectrum. Light cannot be described with one model - - - Light is either described as a wave or as a particle.
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1. Recognize that light has wave and particle characteristics
2. Relate energy of light to its frequency
3. Know the parts to the EM spectrum
Light reflects, refracts, diffracts, undergoes interference, and exhibits the Doppler effect in the same manner that any wave would reflect, refract, diffract…
We think of light as little packets of energy. Blue light has one size packet that is greater than the Red light, which has another size packet.
The name we give these packets are PHOTONS
These photons are NOT particles – they have no mass – think of them as bundles of energy.
We have this model because of the photoelectric effect, which shows that a dim blue light can knock an electron out of a metal atom where a very bright red light cannot.
Radio Waves are used for radio broadcasts, amateur radio, television, and mobile phones.
Different parts of the radio spectrum have been allocated to the various services. Radio waves have a much longer wavelength that light waves.
The longest waves are several kilometers in length. The shortest ones are only millimeters long.
The really nice thing about radio waves is that they will make the electrons in a piece of copper wire move; this means that they generate electric currents in the wire.
In fact it works both ways: alternating currents in a copper wire generate electromagnetic waves, and electromagnetic waves generate alternating currents.
Ultraviolet rays can be used to kill microbes. Hospitals use UV lamps to sterilize surgical equipment and the air in operating theatres.
Large doses of UV can damage the retina in your eyes, so it's important to check that your sunglasses will block UV light.
These waves have very high energy and very short wave lengths.
Some animals like honey bees can see ultra-violet light.
Some plants have white flowers, at least you think that they are all white, but they may appear to be different colors to a honey bee because of the amounts of ultra-violet light which they reflect.