(Solved): 1) Feedback in rectangular cavities This rectangular cavity has dimensions of 17.15cm by 10cm. ...

1) Feedback in rectangular cavities This rectangular cavity has dimensions of $17.15\mathrm{cm}$ by $10\mathrm{cm}$. a) First assume the microphone is placed at the position marked (1). Find the frequencies of the first three modes that can show feedback. You will need to think about where the nodal lines for each mode are. b) Now assume the microphone is placed at the position marked (2). Again, find the frequencies of the first three modes that can show feedback.