Dr. Ranjana Abhang
E-resources e.g. computer simulations, animations can be integrated with usual lectures for communicating the topic effectively. Even the lectures can be delivered with power-point presentations instead of using the conventional method of blackboard and chalk. It is illustrated as followsTopic: Atomic Structure
1. A powerpoint presentation by S.Morris (2006) on the site www.worldofteaching.com contains 18 slides which give the History of Atom from Democritus, John Dalton, Thompson, Rutherford till Bohr. Two ways of Representation of Atomic structure are explained with diagrams: 1. Electronic Configuration 2. Dot and Cross Diagrams of some elements (Not known much).2, An Animation on the Bohr’s Model is on the site www.learnerstv.com by David H. Harrison (2003). It uses Macromedia Flash Player. Orbits of Hydrogen Atom, Excitation of electron to higher orbit by incident photon and emission of photon when electron returns to ground state can be seen. By selecting from five values of excitation photon energy, transition to different higher levels can be seen .
3. An interactive simulation using Java is on the website of University of Colorado at Boulder http://phet.colorado.edu/simulations. During the experiments photons /alpha particles are shooted at the atom and “what really happens” can be seen. Light controls using white and monochromatic light of different wavelengths are available for performing the virtual experiments. Prediction of the results according to six atomic models (1. Biliard Ball model, 2. Thomson’s Plum Pudding Model, 3. Classical Solar system model, 4. Bohr’s model; 5. De Brogli model using the wave particle duality, 6. Schrodinger’s model using concepts of Orbital quantum number and Magnetic quantum number). Energy level diagram is drawn and a spectrometer shows the spectral lines in the experiment for each model. Provision for varying the speed of actions (from low to high) is also available.4. Learning Projects
The website http://www.thinkquest.org/library/ contains a library of 7000 projects created by students which won awards in ThinkQuest Competition. One of the projects is “Journey into the Atom” by Rahul Jain and Shaheen Gandhi (1997), Bridgewater, NJ, USA. Students can be encouraged to do similar projects and participate in the global competition.
Software installation needed to use e-Resources can be downloaded from sites as follows
Java 1.5 or higher from the website of Sun Microsystems Inc., www.sun.com
Adobe Macromedia Flash player from http://www.soft32.com/
Similar information on various topics will appear in the bulletin every month. The teachers are requested to give a feedback on the utility and the response of the students to the material on the website.