Which sentence would best introduce this series of events in a descriptive narrative? We found enough buckets, rags, sponges, and soap to wash cars all afternoon. Upon learning that the cost of scout camp had unexpectedly increased, my troop quickly formed a clever plan. Using colorful paint, we created posters to hold by the side of the road that read, "Car Wash Here Today!" When the first car rolled into the lot, we were lined up and ready to start our fund-raising.

An observer that stands still as the electron moves by him, will observe

What type of nuclear decay causes the atomic number of an element to increase by 1?

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.