Which of the following is not an example of separation by physical means?

distillation
sublimation
boiling
electrolysis

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.