(a) calculate the number of photoelectrons per second ejected from a 1.00-mm 2 area of sodium metal by 500-nm em radiation having an intensity of 1.30 kw/m2 (the intensity of sunlight above the earth’s atmosphere).
(b) given that the binding energy is 2.28 ev, what power is carried away by the electrons?
(c) the electrons carry away less power than brought in by the photons. where does the other power go? how can it be recovered?

Shelly experiences a backward jolt when the driver starts the school bus. which of the following explains this phenomenon? a. the inertia of shelly b. the inertia of the bus c. the normal force of the seats on shelly d. the net force acting on shelly in a backward direction e. a zero net force acting on shelly

Examine the nuclear reacti why is this classified as a nuclear reaction rather than a chemical reaction? it is not balanced. a new compound is formed. a change has occurred in a nucleus. a new element has been formed.

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?