E-field and string pulses
ompare and contrast the propagation of a pulse on a string and an electromagnetic pulse. In particular, address the similarities and differences for
- how the pulse "knows" to move from one position to the next;
- what will happen if the wave is passed through a slit. (See the figure.)
Note to the instructor: The issue here definitely includes a serious dose of "representation translation." Some students interpret the graph of electric field along a line as extending into space. If the "E-field vector can't fit through the slit" its intensity will be reduced. This isn't so crazy when analyzed in terms of p-prims. A smaller slit does produce a smaller intensity. "Not fitting through" is a plausible interpretation.
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Page last modified
October 31, 2002: OP15