Chapter 9, Problem 8RAT

A firewalker walking barefoot across hot wooden coals depends on wood's

(a) good conduction.

(b) poor conduction.

(c) low specific heat capacity.

(d) low radiation.

To determine

The correct option for the statement "A firewalker walking barefoot across hot wooden coals depends on wood's".

Answer to Problem 8RAT

The correct option for the statement "A firewalker walking barefoot across hot wooden coals depends on wood's" is option (b).

Explanation of Solution

Holding an iron rod from one end and nail from the other end in the flame, then the other end of the rod gets hot. But in the case of a glass rod, it takes some time. And this process of heat transfer is termed as conduction.

Conduction in the solid takes place due to the collision of molecules. As the molecules strike to each other, they transfer the thermal energy, and this process continues until the equilibrium attain.

The rate of transfer of thermal energy depends on the conductivity of the material, so the good conductors quickly transfer the thermal energy as compare to bad conductors. The wood is one of the examples of poor conductor of heat so that a firewalker will walk easily across wooden coal.

Conclusion:

Therefore, the correct option for the statement "A firewalker walking barefoot across hot wooden coals depends on wood's" is option (b).