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Archive for August 15th, 2008


The Momentum of Social Networks (Part 4): Doppler Shift

Written by: Bill Sherman on Friday, 15 August 2008, 6:17 AM

Fire Trucks and the Doppler Effect

When we hear a fire-truck’s siren, we hear the Doppler effect. The sound of the siren starts out high, then as the fire-truck approaches, the pitch decreases. At some moment, the truck will neither be approaching or receding from you. At that moment, the pitch will be equal to the [...]

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Posted in: Social Networks | 2 Comments


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