On a quiet day while standing on a sidewalk you hear a friend holding a tuning fork produce a pure 440 hz sound tone when she sees you, she begins to ride her bike toward you. when she passes by you, she does not stop; instead, she continues biking away from you 1) which of the following plots best represents qualitatively the frequency you hear of the wave emitted by the tuning fork? case a case b case c which of the following statements is true while your friend is approaching you? case a case b case c none of them the wavelength of the sound you hear increases the sound intensity level of the sound wave emitted by the tuning fork increases o you start to hear beats