Who says you can’t un-ring a bell? As a team of acoustical engineers and a biomedical engineering student demonstrate, “destructive interference” can can silence even a huge temple bell – leaving a sleeping baby undisturbed.

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Filed under: Special Features | Comments Off on Unring A Bell? Acoustic Engineers Can!

Tags: acoustic engineering, bell, Contest, fun with technology, sound, sound wave, STEM education, unring a bell

In this activity, students in grades 7 to 9 explore material properties as they relate to motion detection, and use that knowledge to make design decisions about what types of motion detectors to use in specific applications, such as conserving energy in commercial buildings.

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Filed under: Class Activities, Grades 6-8, Grades 9-12 | Comments Off on Beat the Motion Sensor

Tags: absorption, architectural engineering, building, Clarence L. Elder, Design, Doppler effect, Electrical Engineering, Energy, Energy and Environmental Technology, energy conservation, lighting, material properties, materials, motion, motion detectors, reflection, sensor, sound wave, visible light