Light with an energy equal to three times the work function of a given metal causes the metal to eject photoelectrons. What is the ratio of the maximum photoelectron kinetic energy to the work function?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.