Any Sound from One Focus of an Ellipse Reflects Off

question 58

Multiple Choice

Any sound from one focus of an ellipse reflects off the ellipse directly back to the other focus.This property explains whispering galleries such as Statuary Hall in Washington,D.C.The whispering gallery shown in illustration has the shape of a semi-circle.Find the distance sound travels as it leaves focus F and returns to focus F'.Round your answer to one decimal place,if necessary.​ ​

• A)16 meters
• B)16.8 meters
• C)33.5 meters
• D)32 meters
• E)31.2 meters

---

Definitions:

Classical Conditioning

The process in which learning is achieved by regularly pairing two stimuli until a response once caused by the second stimulus becomes caused by the first stimulus.

Conditioned Stimulus

A stimulus that was once neutral but, after pairing with an unconditioned stimulus, now triggers a conditioned response.

Higher-order Conditioning

A form of conditioning involving the modification of reaction to a neutral stimulus by first associating this stimulus with another conditioned stimulus.

Conditioned Stimulus

A previously neutral stimulus that, after becoming associated with an unconditioned stimulus, is able to elicit a conditioned response.