(adsbygoogle = window.adsbygoogle || []).push({}); 1. Two piano strings are supposed to be vibrating at 128 Hz, but a piano tuner hear three beats every 2 seconds when they're played together

a) If one is vibrating at 128 Hz, what must be the difference between their frequencies?

Answer - 3 Beats Per Two Seconds, Frequency Diff = 1.5

b) By how much in percent must the tension be increased or decreased to bring them in tune?

-- B is where i'm stuck on. I have the two equations v= lambda x frequency and

velocity = sqrt ( Tension / mass per length )

So I set both of them equal to each other and found that the Tension is proportional to the Frequency Squared?? I'm not sure if this is the right direction :( And if it is I tried putting in the number percent but it didn't work ( Sqrt 1.5 )

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Frequency on Waves and Tension Quick Question

**Physics Forums | Science Articles, Homework Help, Discussion**