In a photoelectric effect experiment, electrons emerge from a copper surface with a maximum kinetic energy of 1.10 eV when light shines on the surface. The work function of copper is 4.65 eV.
Which one of the following values is closest to the wavelength of the light? (h = 6.626 10-34 J s, c = 3.00 108 m/s, 1 eV = 1.60 10-19 J)
A) 360 nm B) 150 nm C) 1100 nm D) 220 nm
Question 2
A reversible engine takes in heat at a rate of 555 W and exhausts heat at 482 W.
(a) How much power does it produce?
(b) What is its efficiency?
(c) If operated in reverse as a refrigerator, what would be its performance coefficient (COP)?
This is a still image from an animation of ocean surface currents from June 2005 to December 2007
Surface Tension
lower surface of Arabidopsis thaliana leaf, showing a trichome
Juglans nigra (Black Walnut tree) lower leaf surface
A Possible Problem with the Anger and Concentration Experiment
Surface ocean currents