Physics 215 Winter 2002 Introduction to Modern Physics Prof. Ioan Kosztin Lecture #23 Solid State Physics • Bonding in solids (metals‚ isolators‚ semiconductors) • Classical free electron theory of metals • Quantum theory of metals • Band theory of solids • Semiconductors • Lasers Classification of solids • Phases of matter: • solid (well defined shape and volume) • liquid (only well defined volume) • gas (no defined shape or volume) • plasma (an overall neutral collection of charged
Premium Solid Electron Metal
more electrons you have‚ the more electricity you will get. Batteries are expensive‚ but you can make one for exactly 24 cents! In this experiment‚ you will make your own voltaic pile using pennies and nickels. In the data‚ we will see if the number of pennies and nickels will affect the number of voltage and current. Problem How many coins in the pile will make the most electricity? Hypothesis If there are more coins‚ then the more electricity it can produce‚ because the more electrons you
Premium Electric current Electric charge Battery
BCMB 311‚ Advanced Cell Biology‚ Fall 2012 EXAM 1 __________________________________Name True-False Questions (Write T or F next to the question‚ 1 point each) 1. A globular protein in the cytoplasm will normally be folded up in such a way that most of its non-polar sidechains are buried in the interior of the protein and most of its polar and charged side-chains are exposed on its surface. T 2. Alpha helices are stabilized by hydrogen bonds between amino acid side chains‚ whereas beta
Premium Protein Hydrogen bond Electron
taking the electrons from the bond with it. The more stable the leaving group as an independent assemblage‚ the more readily it will depart the molecule. Carbocation: A carbon with only 6 shared valence shell electrons. A full positive charge resides on the carbon. Carbocations are electrophiles. Nucleophile: An atom or assemblage of atoms which will donate electrons to form a new covalent bond. Strong nucleophiles are strong Lewis bases. Electrophile: An atom which will accept electrons and form
Premium Hydrochloric acid Atom Sodium bicarbonate
COE CHEMONE Reviewer for CHEMONE Finals Rules for Counting Significant Figures 1. Nonzero integers. Nonzero integers always count as significant figures. 2. Zeros. There are three classes of zeros: a. Leading zeros are zeros that precede all the nonzero digits. These do not count as significant figures. In the number 0.0025‚ the three zeros simply indicate the position of the decimal point. This number has only two significant figures. Note that the number 1.00 _ 102 above is written in exponential
Premium Chemical bond Gas Atom
crystalline surfaces including both atomic structures and electron arrangement. The STM tip produced in this experiment acts as a needle that hovers above the crystalline material surfaces (perfect atomic structural patterns) with nanoscale accuracy‚ while emitting electrons from a few nanometers above the surface of the crystalline materials‚ utilizing the quantum tunneling effect to scan the surface atoms and electrons. In classical physics; electrons would not be able to pass through certain conductive
Premium Electron Sodium hydroxide Chemistry
3) written assignment This written assignment covers assessment criteria 5 and 6 The Photoelectric effect‚ and the Production of Light In 1887 Hertz discovered the photoelectric effect‚ where electrons were emitted from a zinc surface when illuminated with ultra-violet light. These electrons (called ‘photoelectrons’) were only emitted when the frequency of the ultra-violet light was above a certain value (called the ‘threshold frequency’). Criteria 5c Assume that ultra-violet light is falling
Premium Light Photon Quantum mechanics
Mass Stopped by Alpha 2 protons 2 neutrons +2 Large Paper Beta Electron formed with neutron inside -1 Small Aluminum Gamma Electromagnetic wave 0 Tiny Lead 4) Open folder ‘ionisation’ and watch the video. Look closely at the particles emitted by the source at the end of the animation - what type of emission is this? Explain how these particles can cause an electric current to travel through air. An electron will be taken from the surface which is attracted to the positive plate
Premium Ionizing radiation Electron Radioactive decay
1. How is electricity produced? The most simple way of producing static ekectricity is by rubbing or friction. When you rub two different kind of materials that are insulator‚ you can transfer electrons from one substance to another. Nowadays‚ to create electricity we use battery and generators. Voltage can be made by heart‚ light or mechanical pressure. http://science.howstuffworks.com/electricity-info2.htm 2. Where and how is electricity used? Electricity gives us ability to produce
Premium Electricity Lightning Electron
inside them. The electrons carry negative charge and the protons carry positive charge. The basic unit of charge (called the elementary charge)‚ is the amount of charge carried by one electron. The charge on a single electron is qe = 1‚ 6x10−19 C. All other charges in the universe consist of an integer multiple of this charge (i.e. Q = nqe). This is known as charge quantisation. All the matter and materials on earth are made up of atoms. Some materials allow electrons to move relatively freely
Premium Atom Electron Electric charge