Wide-angle lenses will . a. preserve sharp focus from foreground to background b. make objects moving toward the camera appear to be not moving at all compress c. the distance between foreground and background d. are good at rack or selective focusing

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

An object's buoyant force and weight mean the same thing.a. trueb. false

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