Answered

A strong lightning bolt transfers about 24C to Earth. How many electrons are transferred? The elementary charge is 1.60218x10^-19 C



Answer :

johnson4
here T is the tension and μ the mass per unit length of the string. 
Therefore, to double the wave speed on the string, the tension has to increase by a factor of 4. 

In your notation: F2/F1 = 4