A student generates water waves in a pool of water. In order to increase the energy carried by the waves, the student should generate waves with a
(1) greater amplitude (2) higher frequency (3) greater wavelength (4) longer period

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e