Standing Wave in String and Organ Pipe: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Standing Wave in String and Organ Pipe. Understanding the underlying formula is key to arriving at the correct answer below:

A standing wave with 3 nodes and 2 antinodes corresponds to 2 full loops. The length of one loop is $\lambda/2$. Total distance $L = 2 \times (\lambda/2) = \lambda$. Therefore, the wavelength $\lambda = 1.21 \text{ \AA}$.