A 2000 Hz siren and a civil defense official are both at rest with respect to the ground. What frequency does the official hear if the wind is blowing at 12 m / s (a) from source to official and (b) from official to source? | Numerade

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Personal Self Defense Alarm，130db Self Defense Siren Safety Alarm For Women Girl, Personal Keychain Alarm Rechargeable Battery - Walmart.ca

Historical tornado siren significance marking 70 years