Final answer:
While the specific distance for hearing a car horn is not provided, car horns are typically audible at least 200 feet away. The perception of sound from a distance can be affected by factors such as ambient noise, the loudness of the horn, and the Doppler effect, which explains changes in frequency as a vehicle moves relative to an observer.
Step-by-step explanation:
The distance at which you should hear the sound of a car horn can vary significantly depending on environmental conditions such as ambient noise levels, the car's horn loudness, and atmospheric conditions. However, there isn't enough information provided in the question to determine a specific distance like 50 feet, 100 feet, 200 feet, or 500 feet. Typically, car horns are designed to be heard from at least 200 feet away in typical urban traffic conditions to ensure safety. Nevertheless, for educational purposes and sound physics, other aspects such as the minimum frequency variation humans can detect (10 Hz), the range of human hearing (20 Hz to 20,000 Hz), and the Doppler effect as it relates to the perceived frequency of sounds, like a siren from an ambulance, or a car horn are important concepts to consider when discussing the perceivability of sounds from a distance.
The Doppler effect particularly is a relevant phenomenon that illustrates how the perceived frequency of the sound of a car horn can change as the vehicle moves towards or away from an observer. According to the provided information, the frequency perceived from a source moving away, such as a train at 50.0 m/s or an ambulance passing by, changes based on the relative velocity between the source and the observer. For instance, if an ambulance passes you at 15.0 m/s with a siren at 995 Hz, the frequency you perceive will be different before and after it passes (Doppler shift).