The College Board has developed the "AP Central" website to provide resources for teachers seeking to improve their students' performance on AP exams, including human geography, chemistry, and European history. This...
In 1953, Gottfried Moellenstedt invented the electron biprism, more or less by accident, with the serendipity characteristic to him: Aiming at dark-field imaging in an electron microscope, he stretched a thin tungsten...
This resource discusses wave interference and quantum waves associated with particles. A shockwave simulation gives an illustration of the quantum double-slit experiment. Questions lead the students through the...
Look inside a resistor to see how it works. Increase the battery voltage to make more electrons flow though the resistor. Increase the resistance to block the flow of electrons. Watch the current and resistor...
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