Bat Echolocation

A big brown bat and its insect prey. Photo by Jessica Nelson

Bird Song

A black-capped chickadee (Parus atricapillus) and a sonogram of its call. Photo courtesy of Stephen Nowicki, Duke University

Good Vibrations

The finger applies pressure as it circles the rim of a wine glass, the glass vibrates making a high pitch, and the excited water shoots out of the glass in all directions. Photo from the AAPT High School Physics Photo Contest by Thomas Alper of West Boca Raton High School. Copyright AAPT.

Hearing the back of a penny

Penny scan using a Scanning Acoustic Microscope (SAM). The scan shows sound reflections from both the front and the back of the penny. Image courtesy of Caleb Farny, Aerospace and Mechanical Engineering Department, Boston University.

WW II Fighter

Synthetic-aperature SONAR image of a World War II Fighter at the bottom of the ocean. Image by Brent L. Douglas and Hua Lee, University of California at Santa Barbara.

Trumpet

Sound waves produced by a trumpet. Notice the waves coming from the valves as well as from the bell!

Sunken Ship