A violin is tuned by adjusting the tension in the strings. Brian's A string is tuned to a slightly lower frequency than Jennifer's, which is correctly tuned to 440.0 Hz.
(a) What is the frequency of Brian's string if beats of 2.0 Hz are heard when the two bow the strings together?
(b) Does Brian need to tighten or loosen his A string to get in tune with Jennifer? Explain.