Musicians can use beats to tune their instruments. One flute is properly tuned and plays the musical note A at exactly 440Hz. A second player sounds the same note and hears that her flute is slightly "flat" (that is, at too low of a frequency). Playing at the same time as the first flute, she hears one loud-soft-loud beat per second.

Question

What is the frequency of her instrument?

I have no clue how to do this, my final is tomorrow. Please help!

Answer 1

it is one hz off, low. 439hz.

I have never heard of a person who can detect lower than 20 hz. In fact, most physics books actually say the range of hearing starts at 20hz.