Lecture7 - Homework#2 due no later than Friday February 3...

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Homework #2 due no later than Friday, February 3, 5:00 pm. Answers to Homework #1 are now posted on the Homework page of the class website
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Three Basic Types of Energy kinetic energy of motion potential stored energy; e.g., chemical, gravitational, electrical, etc. radiative energy transported by light (electromagetic radiation)
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Is there a problem with perpetual motion machines?
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Radiative energy: energy carried by electromagnetic radiation. We will discuss electromagnetic radiation following a brief discussion of matter.
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Atom nucleus electron e - proton neutron p + n
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Although it is the smallest part of the atom, most of the atom’s mass is contained in the nucleus.
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Protons have a positive electrical charge Electrons have a negative electrical charge In a typical neutral atom, there are equal numbers of protons and electrons The electrons do not “orbit” the nucleus; they are “smeared out” in a cloud which give the atom its size.
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Incorrect  view better  view
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The particles in the nucleus determine the element & isotope.
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Type of element is determined by #protons atomic number = #protons Isotope of element is determined by # neutrons atomic mass number = #protons + #neutrons
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Hydrogen e - p + atomic number = 1 atomic mass number = 1 e - p + n e - n p + atomic number = 2 atomic mass number = 4 Helium Different Elements (different # protons)
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Element 1 Hydrogen (H) 2 Helium (He) 3 Lithium (Li)
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Lecture7 - Homework#2 due no later than Friday February 3...

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