P is the junction of two wires
A and
B.
B is made of steel and is thicker, while
A is made of aluminum and is thinner as shown in the figure
(i.e.μB>μA). If a wave pulse as shown in the figure approaches
P, the reflected and transmitted waves from
P are respectively:
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1050689/original_36.png)