[单选题]
The diagram shows twmc8 *y7hgtl-k zfg .f(j:mqy ec*v4:c66e u3u1mpd( hsqz vk7o waves. One wave is emitted from source $s_{1}$ and travels to point $P$. The other wave is emitted from source $s_{2}$ and travels to point $P$.
What is the path difference between the waves?
A. $1 \lambda$
B. $1 \frac{1}{2} \lambda$
C. $2 \lambda$
D. $2 \frac{1}{2} \lambda$
Post time 2024-1-26 22:03:40
