(a) What are the three features of measurement of a quantum system, e.g., angular momentum of an electron, compared to a classical system, e.g., angular momentum of a football. Explain each of them in a sentence or two. [3 marks] (b) Suppose I write the following quantum state: 1x) = =lu)+ 3V/2 10) Briefly comment on this state, e.g., is it a valid and perfectly good way to write a state, is it valid but not so good, is it invalid? What is right/wrong with this state? [1 marks] (c) Using the definition: 10) = #lu) - =ld) Obtain an expression for |x) that is entirely in the lu)/|d) basis. [2 marks]