Consider a situation where you are standing near a busy street, and you hear the sound of various vehicles passing by. The sounds you hear vary in pitch and loudness, depending on the type of vehicle and its speed. Sound waves travel through the air and reach your ears, allowing you to hear these different noises. Think about how sound waves behave and how they are perceived by your ears. Which statement best describes how sound waves travel and are heard?
A) Sound waves travel in straight lines and can only be heard if the source is stationary.
B) Sound waves travel as vibrations through the air and can vary in frequency and amplitude.
C) Sound waves cannot travel through air and require a solid medium to be heard.
D) Sound waves travel as a single constant tone regardless of the source.