Science Projects And Inventions

Has this ever happened to you that you were watching a cricket match on the televison and you let out a cheer when a player hit the ball over the fence. Try it. Stand as far away from the television set as possible, then cheer as loudly a possible. You will notice that, when you do this the sound distorts the picture on the screen. It seems as if the vertical hold in the television is malfunctioning.

HOW DOES IT WORK?

Surprisingly the cheer you let out has no effect on the television screen whatsoever. The strong vibration of the sound you have just made rattles your eye and it creates a strobe effect influencing your vision of the television screen’s scanning beam. This is what creates the blurring effect.