A sound wave is made up of a sequence of travelling pressure changes away from the usual, steady air pressure. The graph illustrates these pressure changes for two waves at a single moment in time. Wave 1 has an intensity of $1.6 \times 10^{-6}\ \text{W m}^{-2}$. What intensity does wave 2 have?
- A$2.4 \times 10^{-6}\ \text{W m}^{-2}$
- B$3.0 \times 10^{-6}\ \text{W m}^{-2}$
- C$3.6 \times 10^{-6}\ \text{W m}^{-2}$
- D$4.5 \times 10^{-6}\ \text{W m}^{-2}$