What factors are associated with the advanced performance of japanese students on standardized tests?

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Matter that emits no light at any wavelength is called