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A 441 Hz tuning fork is sounded at the same time as a 437 Hz tuning fork. What beat frequency will you hear? 2 10. A tuning fork of unknown frequency is sounded at the same time as one of frequency 443 Hz, resulting in the production of beats. Over 15 s, 45 beats are heard. What are the possible frequencies of the unknown tuning fork? 3 11 A vuvuzela of length 0.75 m is used to make an annoying sound in a soccer stadium. The vuvuzela acts like an air column which is closed at one end and the speed of sound in air is 350 m/s. Determine the wavelength and frequency of the two lowest frequency sounds that the vuvuzela can make. (complete the diagrams in your answer) 4