Answer:
Amplitude changes by factor of 2 means double.
Explanation:
Given:
If the power delivered to the string is quadrupled.
From the formula of power transmitted by a sinusoidal wave on a stretched string is,
Where 
mass per unit length, 
angular speed, 
amplitude, 
wave speed, 
power delivered.
Here we need only two terms power and amplitude.
∝ 
All other quantities are constant for our problem,
Where 
constant
Here Power become quadruple means four times,
So amplitude changes by factor of 2 means double
Answer:
Time taken for 1 swing = 3.81 second
Explanation:
Given:
Time taken for 1 swing = 2.20 Sec
Find:
Time taken for 1 swing , when triple the length(T2)
Computation:
Time taken for 1 swing = 2π[√l/g]
2.20 = 2π[√l/g].......Eq1
Time taken for 1 swing , when triple the length (3L)
Time taken for 1 swing = 2π[√3l/g].......Eq2
Squaring and dividing the eq(1) by (2)
4.84 / T2² = 1 / 3
T2 = 3.81 second
Time taken for 1 swing = 3.81 second
If they research it then they would get the answer that they need to find out of the universe that is what I think.
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