In a Whispering Gallery, Any Sound at One Focus of an Ellipse

question 19

Short Answer

In a whispering gallery, any sound at one focus of an ellipse reflects off the ellipse directly to the other focus. The figure shows an elliptical whispering gallery, where x is the center of the ellipse. What is the distance that sound travels from focus $F_{1}$ to focus $F_{2} ?$

---

Definitions:

Sick Leave Programs

Employer-provided benefits that allow employees to take time off work with pay when they are ill, to ensure health recovery without the loss of income.

Family and Medical Leave Act

A federal law in the United States that grants eligible employees the right to take unpaid, job-protected leave for family and medical reasons.

Eligibility Requirements

Specific criteria or conditions that individuals must meet in order to qualify for a program, service, or position.