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Egee Notes Quiz 1 Essay

982 words - 4 pages

Fusion occurs when two small nuclei join together to create one large nucleus or particle, and during this process, energy is released in the form of light and heat  An example is in the Sun, hydrogen nuclei fuse (combine) together to make helium nuclei which releases energy.

Fission- occurs when the nucleus of one big atom splits into 2 new atoms and a tremendous amount of energy is released in the form of light an heat. (nuclear reactor or interior of the earth, uranium nuclei split apart causing energy to be released)

Some of the matter making up the nuclei is converted into energy
E= mc^2
Energy = mass X (Speed of light)^2

Indicated that energy intrinsically stored in matter ...view middle of the document...

The lower the energy the longer the wavelength and The lower the frequency and vice versa

Sun= unltraviolet rays (high energy photons) short wavelength and high frequency
Fireplace- low energy photons (long wavelength and high frquencies)

--about 20% of the electricity used in US is used to produce visible light for lighting purposes

Energy can be converted from one form to another.
* Gasoline (chemical) into our cars, with the help of electrical energy from a battery, provides mechanical (kinetic) energy.
* Purchased electricity is fed into our TV and is converted to light and sound.
* Similarly, purchased electricity goes into an electric bulb and is converted to visible light and heat energy.
* The image below shows examples of more conversions.
British Thermal Unit –BTU

Unit | Definition | Used In | Equivalent to |
British Thermal Unit BTU | A unit of energy equal to the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit. Equivalent to energy found in the tip of a match stick. | Heating and Cooling industries | 1 BTU = 1055 Joules (J) |
Calorie or small calorie (calorie) | The amount of energy needed to raise the temperature of one gram of water by one degree Celsius. | Science and Engineering | 1 calorie = 0.003969 BTUs |
Food Calorie, Kilocalorie or large calorie (Cal, kcal, Calorie) | The amount of energy needed to raise the temperature of one kilogram of water one degree Celsius. The food calorie is often used when measuring the energy content of food. | Nutrition | 1 Cal = 1000 cal, 4,187 J or 3.969 BTUs |
Joule (J) | It is a smaller quantity of energy than calorie and much smaller than a BTU. | Science and Engineering | 1 Joule = 0.2388 calories and 0.0009481 BTUs |
Kilowatt Hour (kWh) | An amount of energy from the steady production or consumption of one kilowatt of power for a period of one hour. | Electrical fields | 1 kWh = 3,413 BTUs or...

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