Why You Can't Hear Volcanoes Erupt

The video explores the phenomenon of sound shadows, which can make sounds inaudible even when close to the source. It discusses historical examples, such as battles during the American Civil War, where sound shadows affected outcomes. The physics behind sound shadows, including wind and temperature inversions, is explained. The impact on marine life, where sound shadows can lead to collisions with ships, is highlighted. Finally, the video covers applications in engineering and urban planning to manage noise and improve environments.

What is a sound shadow?

• A shadow created by light

• A visual illusion

• A phenomenon where sound is blocked or redirected

• A type of echo

During the American Civil War, how did sound shadows affect battles?

• They had no effect

• They caused confusion by making sounds inaudible

• They made battles louder

• They helped soldiers communicate better

What atmospheric condition can cause sound shadows?

• Temperature inversion

• Snow

• Rain

• Fog

How do sound shadows affect marine animals?

• They block or redirect ship sounds, confusing animals

• They make it easier for animals to hear ships

• They amplify ship noises

• They have no effect on marine life

What solution has been developed to help marine animals detect ships?

• Quieter propellers

• Underwater lights

• High frequency sound devices

• Louder ship engines

In concert halls, what is the goal of acoustical engineers regarding sound shadows?

• To eliminate sound shadows for better acoustics

• To create more sound shadows

• To use sound shadows for decoration

• To make sound shadows visible

How can urban planners use sound shadows to reduce noise?

• By building more roads

• By creating barriers that absorb or redirect sound

• By increasing traffic

• By planting more flowers