The work function of palladium is 5.22 ev.
(a) what is the minimum frequency of light required to observe the photoelectric effect on pd?
(b) if light with a 200 nm wavelength is absorbed by the surface, what is the velocity of the emitted electrons?

Can someone explain to me how to do this problem ?

Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.