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Homework Statement
A wave has an amplitude a1, intensity I, and frequency f. A second wave of the same type has twice the intensity and double the frequency, find the amplitude of the second wave in terms of a1.
Homework Equations
Using the relationship I=k a2f2, where k is a constant:
The Attempt at a Solution
[itex]\frac{I}{a12f2}[/itex] = [itex]\frac{2I}{a22(0.5f)2}[/itex]
So a2 = √8 a1
But according to my answer key, the answer is √2 a1