In a thundercloud there may be electric charges of +39.0c near the top of the cloud and-39.0 c near the bottom of the cloud. these charges are separated by 2.30 km. what is the electric force on the top charge? magnitude ndirection repulsive o attractive need ? read it my notes ask your teach 2 1 points serpse9 23 p007 a molecule of dna (deoxyribonucleic acid) is 2.31 um long. the ends of the molecule become singly ionized: negative on one end, positive on the other. the helical molecule acts like a spring and compresses 0.93 % upon becoming charged. determine the effective spring constant of the molecule. n/m need ? read it

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.

How is zig zagging a form of acceleration?

The energy equivalent of the rest mass of an electron is