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Spectrum

A wave is a disturbance that travels through space and time , usually by the transfer of energy . What we see as light is really a wave of energy traveling through space. Spectrum. 1. What kind of electromagnetic radiation has the shortest wavelength?

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Spectrum

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  1. A wave is a disturbance that travels through space and time, usually by the transfer of energy. What we see as light is really a wave of energy traveling through space.

  2. Spectrum 1. What kind of electromagnetic radiation has the shortest wavelength? 2. What kind of electromagnetic radiation has the longest wavelength?

  3. 3. What kind of electromagnetic radiation has a wavelenth that spans between the diameter of a baseball to the length of a soccer field? 4. What kind of electromagnetic radiation has a wavelenth that is about the diameter of one water molecule?

  4. Roy G Biv – a continuous spectrum

  5. 5. Some insects, like bees, can see light of shorter wavelengths than humans can detect. What kind of radiation do you think a bee sees?

  6. Light vocabulary: reflection refraction absorption emmission

  7. Some materials emit light without being hit by light first - another energy source (for example, heat or electricity) is used instead to first excite the material, and then that energy is turned into light. For example, a common light bulb emits light when electricity is passed through it. The smallest amount of light that can be emmitted is a photon.

  8. Sound waves and water waves are not particulate, meaning they are not made up of particles. They are created by a physical disturbance in their media. What does that mean?

  9. A higher energy level is one that is farther from the nucleus.

  10. Electrons may absorb the photons' energy and escape from the material (as shown at the top of the diagram). Scientists in the late 19th century observed this phenomenon and called it the photoelectric effect. OR Electrons in the atoms of the material may absorb the photons' energy and jump to a higher energy level. When an electron does this, its atom is said to be "excited." Soon the electron loses the extra energy and returns to a lower level--a process called de-excitation. Often this lost energy escapes from the atom in the form of photons. Excitation and de-excitation are shown at the bottom of the diagram.

  11. What is spectroscopy? Spectroscopy is a scientific measurement technique. It measures light that is emitted, absorbed, or scattered by materials and can be used to study, identify and quantify those materials.

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