Light with a wavelength of 5.0 . 10-7 m strikes a surface that requires 2.0 ev to eject an electron. calculate the frequency of the glven wave.
1.5 x 102
6.0 x 1014
17 x 10-15
6.0 x 10-16

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?