60cm 80cm For standing waves to be produced, the length of the string between one end to the joint must be an integral multiple of . The frequency of the wave produced in each wire should be the same.
Therefore,
The mass per unit length of the wire = density of the wire x area of cross section. Make sure you convert all the quantities into the same units. You'll see that
So,
Take
Hence, required frequency is = Plug in the values and you get , frequency = 179.025 hz
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420
60cm 
80cm 
. The frequency of the wave produced in each wire should be the same.
