Ast 105 1st Edition Lecture 23Outline of Last LectureTopic: Big Bang TheoryI. EvidenceII. Original Theory’s Problem a. “the horizon problem”III. Inflation Outline of Current LectureI. Physics of the Small II. Point at Which Physics Becomes High Energy III. The 4 Forces Current LecturePhysics of the Small- High energy physics is the study of the very small- Max Planck: energy of a photon E = hc / λ - λ =hc/E- Wave length rule of light: must use very short lambda to look at the objectAt What Point Does Energy Become “High Energy” Physics?- Begins with looking at the electron Size of an electron: 10-15 m Size of an atom: 10-9 m An electron is a million times smaller than an atom o Represents starting point- About 100 MeV is starting point for high energy physics The 4 Forces These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.1. Gravity 2. Electromagnetic3. Weak 4. Strong- Gravity binds objects that have mass- Electromagnetic force (1040x stronger than gravity) binds objects that have electrical charge - Weak force is responsible for turning a down quark into an up-quark Neutron decay - Strong force binds quarks to form proton and neutrons- Also binds neutrons and protons to form nucleus Quiz over last few lectures at end of class
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