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e/m of Electron |
Clear Measurements in Classic Study of ElectronsThis classic experiment measures the charge/mass ratio of the electron. Features include an internal computer with voltage and current control, built-in power supply, and large Helmholtz coils to produce a uniform magnetic field. The apparatus consists of a vacuum tube within which a fine electron beam is formed. The tube is surrounded by a pair of Helmholtz coils, providing a transverse magnetic field that bends the electron beam into a circular path. Helium gas at low pressure inside the tube fluoresces making the beam visible, and the orbit diameter is measured on an internal glass scale with fluorescent scale marks. The mark lights up when struck by the beam, making it simple to determine the exact beam diameter. An included electron gun indirectly heats a cathode with an accelerating anode.Two panel meters monitor the power supplies. The accelerating voltages can be varied from 100 to 500 Vdc, so students can easily study a wide range of electron velocities. The Hemholtz coil current adjusts from 0 to 3A. Size: 11 3/4" x 15 3/4" x 15".
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- Tuesday, November 23, 2010 Excellent Device! Reviewed By: Edward (Stony Brook, New York) This e/m device is the best made, and is all self-contained for ease of student use. Data is easy to acquire and performance is excellent, and e/m value percent difference is very very good. Sadly, this price is highly over-inflated...should be no more than $2000.
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