On a stretched string

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

On a stretched string, a pulse with amplitude

4.0\,\text{mm}

carries

0.20\,\text{J}

of energy. What amplitude must a similar pulse have to carry

1.8\,\text{J}

of energy?