2. List down the following: (a) The next four odd numbers after 107.
(b) Four consecutive even numbers between 2008 and 2030
(c) All odd numbers between 993 and 1007.
3. State whether the following will be odd or even.
(a) The sum of two odd numbers.
(b) The sum of two even numbers. I
(c) The sum of an odd and an even number.

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?