[问答题]
Microwaves generated by a microwave transmitter is diffracted while passing through a slit. A receiver is positioned at a long distance of $D$ from the slit. The receiver is moved between point $A$ and point $C$.
1.Outline what is meant by diffracted microwaves.
2.The receiver records the intensity of the microwave for various positions between $A$ and $C$. It measures zero intensity two times while moving from $A$ to $B$.
(1)On the axes below, draw the variation of measured intensity $I$ with the position $x$ while moving from $A$ to $C$. (There is no need to add values to the axes)
(2)The slit used in the arrangement is replaced by one of greater width. State and explain the changes in the intensity-position graph you have drawn in (b)(i)
