Stroboscope And Falling Water


Demonstrate how a stroboscope works, and illustrate persistence of vision.◙


Water tank with nipple, plastic tube, eyedropper, white background plate, cake pan receptacle, and stroboscope◙with TV camera.

Setup Time

5 min.




A water container with a nipple near the bottom is connected to a plastic tube and eye dropper to produce a stream of water which breaks up into a series of water droplets. The water stream is illuminated by a stroboscope and viewed by a TV camera. Adjustment of the strobe frequency can make the water droplets move up or down either slowly or rapidly, or even stand still!


Karen Brecher and Kenneth Brecher, The "Videostrobe" Water Drop Gravimeter, TPT 28, 108-109 (1990).