Gap Test Arrangement

T.P. Liddiard S.J. Jacobs, "initiation of Reaction in Explosives by Shocks , NOLTR 64-53(1965). The "Modified Gap Test , illustrated here in Fig 8, is identical with the test arrangement described in Ref 58, except that two charge set-ups were used in order to conserve light sources. A... 

Ref 55b) and for the "Susan Test" (Refs 55a, 61 67). It was of interest to determine if the above threshold can be lowered by applying shocks of longer duration and more nearly plane as used in the NOL modified gap test. In this test the pressure falls rapidly because of the action of strong rarefaction waves and in addition, the shock entering the explosive is quite curved. An experimental arrangement which gives a more... 

In order to determine which expls are capable of ignition by an electrostatic discharge of an energy amounted to 100000 ergs, or less it. is necessary to subject each prospective expl to the following energy requirement test . For this a layer of the expl is spread in thickness of 0.010 inch on a steel plate and is separated by a a short gap from a steel needle. This needle is so arranged that it can be thrown into a closed circuit with a condenser of known capacity, on... 

This arrangement would be very satisfactory if there were no gaps or errors in the original publications. Unfortunately, there are many gaps and some discrepancies in most of the papers. The tests are simple but numerous (1035 for a 46-liquid list). Discrepancies may arise through differences in the purity of reagents, especially water content, which is very important. 

Your stellar academic performance at CMU has resulted in a job interview for a very lucrative materials scientist position. As a test, they have given you the following LEDs GaP, Alo.5Gao.5As, GaAs, GaN, GaSb. Arrange these in order of observed color, from red - blue. Explain your rationale. 

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