Question

$P$ is the junction of two wires $\text{A}$ and $\text{B}$. $\text{B}$ is made of steel and is thicker, while $\text{A}$ is made of aluminum and is thinner as shown in the figure. If a wave pulse as shown in the figure approaches $P$, the reflected and transmitted waves from $P$ are respectively:

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

At $P$, partial reflection along with partial transmission will take place.
Here, $\text{A}$ is the rarer medium and $\text{B}$ is the denser medium and wave propagates from rarer to denser medium.
So, the reflected wave undergoes phase reversal, but the transmitted wave doesn't.