The cutoff frequency depends on the wavelength of the part of the EM wave which is used in illuminating the metal.

True
False

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

Which example has gravitational potential energy? a.a horse slowing down from a run b.an apple about to fall from a tree branch c.a bicycle being pedaled down a horizontal path d.beaker sitting on the floor

If a simple machine reduces the strength of a force, what must be increased?