Electromagnetic waves with wavelength 3.05 x 10-11 m are directed at a piece of zinc, and electrons are ejected from the zinc. The work function of the zinc is 4.30 eV = 6.89 x 10-19 J. What is the maximum speed (in m/s) with which electrons are ejected from the zinc? Please provide an answer accurate to three significant figures.

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Diverging mirrors and lenses always produce images

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.