1. The problem statement, all variables and given/known data A trumpet player hears 3 beats per second when she plays a note and simultaneously sounds a 440 Hz tuning fork. After pulling her tuning valve out to slightly increase the length of her trumpet, she hears 5 beats per second against the tuning fork. What was her initial frequency? a) 437 Hz b) 443 Hz c) Either a) or b). d) 435 Hz e) 445 Hz 2. Relevant equations fbeat = |f2-f1| 3. The attempt at a solution I understand how the beat frequency is the difference of the 2 frequencies. So |f1-440| = 3 and |f2-440| = 5. So the first frequency can be 437 or 443 Hz but the answer in only 437 Hz, why?