(a) unpolarised light of intensity io is incident on a linear po- lariser sheet. light emerging from this sheet falls other sheet, which has its transmission axis at right angles to that of the first sheet. (i) what fraction of the incident light emerges from the second sheet? (ii) what happens to the rest of the light? (iii) leaving these two sheets untouched, and using two (2) additional linear polarisers, how could the system be modified so that the emergent intensity is increased? use a diagram to show the arrangement (iv) what is the maximum fraction of io that can now be transmitted through the system? you do not have to prove your answer is correct

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.

Which of the choices are parts of an atom? select all that apply. a.) compound b.) electron c.) neutron d.) molecule e.) photon f.) proton g.) element

Define the terms moral development and moral reasoning.