Which wavefront is moving at a speed nearest to that of a sound wave passing through a solid?
- Aone that moves $10\ \text{m}$ in $0.01\ \text{s}$
- Bone that moves $50\ \text{m}$ in $0.5\ \text{s}$
- Cone that moves $1000\ \text{m}$ in $100\ \text{s}$
- Done that moves $2000\ \text{m}$ in $2000\ \text{s}$