Hebrews tells us "By faith the walls of Jericho fell down, after they were compassed about seven days." God certainly could have used any means he wanted, but clearly points to the faith of the Israelites as the cause of the wall falling down.

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To get a sense of the power of the shofar, we pay a visit to Cantor Daniel Pincus to hear him and his students blow some horns.

Then, we talk to inventor Woody Norris for a modern approach to this biblical challenge.

Now that we understand resonance, back to Jericho; the horns generate audio which is a oscilating force.

If the horn blowers could blow a note matching the frequency if oscillation of the wall, that sound could bring the wall down.

I know I'm late to this party but I just heard the Jericho argument on the radio (maybe a re-run? Anyhow, the discussion went on the direction of sound power (decibels) but that's not the only way to bring down things with sound. Assuming the wind hits the wall head on (not necessary but it makes it easier on the imagination), it's easy to imagine the wind pushing the wall back.

By using the resonance phenomena one (or a group of people) could bring down bridges, towers and even walls. A strong enough wind will bring the wall down by force.Many thanks to the 2010 Shofar All-Stars who played for us: David Liebowitz, Daniela Drakhler, Miriam Frank, Adam Hametz-Berner, Rachel Kelk, Ed Kerson, Anna Levy, Richard Scheiner, and Robert Wine.You kinda forgot it was not just 7 shofars that blew but nearly 3,000,000 Israelites that shouted at the top of their lungs as well and you did not factor in resonance.I thought the unraveling of this mystery was very neat, and I definitely learned some new terms for sound.It never really occurred to me that sound could be directed at a certain spot.Actually the city had two levels of walls, an inner and outer wall or upper and lower wall, and both fell (it was built on a type of hill or tell).