CAPE Physics Unit 1 · 2016 · Paper 1 · Question Q21

Two progressive waves with a phase difference of \pi undergo superposition. If each of these waves has an amplitude of 5\text{ cm}, then what is their resulting amplitude?

1. (A)0\text{ cm}
2. (B)\frac{5}{\pi}\text{ cm}
3. (C)10\text{ cm}
4. (D)5\pi\text{ cm}