Energy required to eject an electron from sodium metal, the so-called work function. Use the relationship between photon wavelength and energy to calculate the work function of sodium (in electron-Volts) based on your measurement in the last problem.

This drawing shows a human body system. what is the primary function of this body system?

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.