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Energy is the ability to do work.

What is Energy?. There are two basic types of energy: 1. Kinetic Energy- The energy of motion. We use this equation:. Energy is the ability to do work. where m = mass of object v = speed of object.

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Energy is the ability to do work.

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  1. What is Energy? There are two basic types of energy: 1. Kinetic Energy- The energy of motion. We use this equation: Energy is the ability to do work. where m = mass of object v = speed of object 2. Potential Energy- exists whenever an object which has mass has a position within a force field. We use this equation: PEgrav = mass * g * height

  2. WAVES

  3. Light What is it? Electromagnetic Radiation (EM) Consists of oscillating electric and magnetic fields (forces). Light is not composed of matter. Light is energy. Light is composed ofphotons(small packets of energy).

  4. Light The energy of a photon can also be written as: E = hc/l c is the speed of light in a vacuum 3x108 m/s And l is the wavelength Duality of light The concept of the photon brings to question the nature of light. Light may act like waves rippling in space or the ocean. If so, this represents the wave-like property of light with constructive and destructive interference. Or light may act similar to a bullet and actually cause matter be relocated. This represents the particle like property of light. The latter property can be explained by the Photoelectric effect.

  5. Einstein's Photoelectrical Effect If you use just the right wavelength on just the right material, the energy can be transferred to the matter. In some cases ejecting an electron. This is how your remote control, TV, microwave and many other devices work. Energy can be transformed into matter with enough speed.

  6. Einstein's Photoelectric effect E - hv Specific color of light Specific metal

  7. ROYGBIV

  8. Electromagnetic Radiationthe visible spectrum ROYGBIV ERE RLNI DALE UDO NL EEIL G ONGE E W OT

  9. Prism The human eye can only see the blend of colors. White light is really composed all the above wavelengths.

  10. The first clue to understanding the role of the electron in the modern atom came from studying the line spectrum of the elements.

  11. Bohr’s Model Bohr imagined the electron moving around the nucleus in circular orbits corresponding to various allowed energy levels. Electrons can only be in “specific or discrete” energy levels. All other values or “orbits” are not possible. These levels are said to be “quantized”. The energy of an electron can only change via a transition. They are not continuous. Bohr’s model works well for hydrogen but fails for heavier atoms.

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