How Can You Wash Dishes With Sound?
By causing ultrasonic vibrations to pass through water in which there are dirty food can literally be shaken right off the dishes. There are dishwashers that work this way. Dried blood and other matter are cleaned from surgical and dental instruments by means of ultrasonic vibrations.
Read More >>What Is A Focus?
When you were examining things with your simple microscope you probably noticed that you could not see clearly when you held the lens just any old distance from the object. You had to move the lens back and forth until the object became clear. Why was this necessary? Your eye has a lens.
Read More >>Why Do Wheels Make Work Easier?
You will use:
Shoebox
Three round pencils
String
Several books
Spring scale
Do this:
Attach the string to the box so that you can pull it. Place several books inside the box.
Attach the spring scale to the string.
Pull the box.
What Is An Electron Microscope?
If we could have some kind of ray, or beam that could be reflected from objects too small to reflect light we could see these objects. There are tiny particles, called electrons that are sufficiently small for our purpose.
Read More >>What Is The "law Of The Lever"?
Early man used the lever, as we have seen, but it was not until thousands of years later —about 240 B.C.
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