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Question:

The predominant frequency of a certain fire truck’s siren is 1650 Hz when at rest. What frequency do you detect if you move with a speed of 30.0 m/s

1. toward the fire truck, and
2. away from it?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

1. $1790 \textrm{ Hz}$
2. $1510 \textrm{ Hz}$