Final answer:
The frequency of the sound you will hear will decrease if you quickly run away from the orchestra at a concert due to the Doppler Effect.
Step-by-step explanation:
The frequency of the sound you will hear will decrease if you quickly run away from the orchestra at a concert. This is due to the Doppler Effect, which is a phenomenon that describes how the frequency of a sound wave changes when there is relative motion between the source of the sound and the observer.
When you run away from the orchestra, you are moving away from the source of the sound. As a result, the wavelength of the sound waves is increased, causing the frequency to decrease. This means that the pitch of the sound you hear will be lower.
For example, if the sound of the orchestra is playing a specific note, as you run away, the pitch of that note will sound lower to you compared to someone who is standing still.