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8. (5 P) A 125 cm length of string has mass 2.00 g and tension force 7.00 N. (a) What is the wave speed for this string? (b)
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Answer #1

Velocity in string is given as, .

v= √{ T/(dm/dl)}; here T=7, dm=2*10^-3, and dl=125*10^-2

So v= sqrt{ (7*125)/2*10-1}

v= 66.14 m/s

Now we noticed that velocity is inversely proportional to square root of mass ,so for mass = 1/4 times of 2 gm that is 0.5 gm , the velocity will be twice.

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