PURPOSE: Demonstrate canal rays present in a cathode ray tube.
DESCRIPTION: Perforations in the cathode of the tube permit positive ions to pass through the cathode, forming "canal rays" or "positive rays." The effect of a magnet on these rays may be compared with its effect on electrons moving in the opposite direction as in demonstration K1-12: CATHODE RAY TUBE - DEFLECTION BY MAGNET. The deflections of the beam are visible if viewed closely with very low ambient light level.
SUGGESTIONS: Best for individual viewing.
REFERENCES: (PIRA unknown.)
EQUIPMENT: Canal ray tube, power supply, bar magnet.
SETUP TIME: 5 min.
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