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Quick quantitative measurements: Built-in photogate slots make data collection fast and reliable
no-fuss operation: Built-in on/off switch and stable output make it easy to demo or run lab stations without complicated wiring or controls
Snell’s Law and the critical angle
Compact launcher for accurate indoor projectile motion labs
cohesive investigation
Secchi Disk Electricity & Magnetism Quick quantitative measurements: Built-in photogateTurn how clear a lake looks into a number you can track The Secchi Disk is an 8. 75" white plastic disk marked with black and white quadrants, attached to a weighted, foot marked line. Lower it into a lake, pond, stream, or aquarium until the pattern disappears from view, then read the depth off the line. That depth, the Secchi depth, is a standard field measurement of water clarity used by limnologists and water quality monitoring programs. The