A student uses a 2.00-m-long steel string with a diameter of 0.90 mm for a stand

Question

A student uses a 2.00-m-long steel string with a diameter of 0.90 mm for a standing wave experiment. The tension on the string is tweaked so that the second harmonic of this string vibrates at 20.0Hz .

Calculate the tension the string is under.

Express your answer using two significant figures.

Calculate the first harmonic frequency for this string.

Express your answer using three significant figures.

If you wanted to increase the first harmonic frequency by 44% , what would be the tension in the string?

Express your answer using two significant figures.

I am not sure what to do on the 3rd part of this question. Please explain

Explanation / Answer

harmonics are the states of a string. first harmonic refers to the smallest frequency , i.e. the longest wavelength

here is the wikipedia page for harminics : http://en.wikipedia.org/wiki/Harmonic

now the answer to that part would be the speed of the wave in the string/ 4*length of the string

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