A block of lead with mass $500\,\text{g}$ is at its melting point. The specific latent heat of fusion of lead is $23\,\text{kJ kg}^{-1}$. What energy is needed to melt the block completely?
- A$46\,\text{J}$
- B$12\,000\,\text{J}$
- C$46\,000\,\text{J}$
- D$12\,000\,000\,\text{J}$