Hint:Thermal conductivity refers it to the inherent ability of a material to convey or direct heat energy. Thermal conductivity is one of the three methods to transfer heat energy, the other two are to be convection and radiation.
Complete step by step solution:
Thermal conductivity calculates the capability of a metal to conduct heat energy. This property differs between various types of metal and is important to consider in implementation where high working temperatures are common. In pure metals, thermal conductivity stays roughly the same with the increases in temperature.
Following are the thermal conductivities of the following metals and alloys: (in terms of $W{m^{ - 1}}{K^{ - 1}}$)
Silver −$430$.
Copper−$400$.
Aluminium −$235$.
Brass−$109$.
That is Silver>Copper>Aluminium>Brass.
Silver has the highest thermal conductivity of any other element and the highest light reflectance. As to why silver is the best conductor, it is that its electrons are freer to move than those of the other elements. This has to do with the reason for its valence and crystal structure. Most metals conduct electricity.
Therefore, silver is the metal among the following that has the highest heat conductivity.
Hence the option (A), silver is the correct answer.
Note:Most of the heat absorbing metal is gold and then copper, but usually copper is held out by many people to be worn because as it absorbs heat but it also cools down the body. Silver definitely reduces the body heat.
