Question

Temperatures of four liquid substances are shown in the chart.

Which statement is best supported by the data in the chart?

A) Substance X will transfer thermal energy to substance Y mainly through radiation if they are mixed.
B) Substance Y will transfer thermal energy to substance Z through conduction if they are mixed.
C) Substance X will transfer thermal energy to substance W through radiation if they are placed near each other.
D) Substance W will transfer thermal energy to substance X through conduction if they are mixed.

Answer 1

For those of you taking the course on Edge, the right answer is D.

Answer 2

Answer: D) Substance W will transfer thermal energy to substance X through conduction if they are mixed.

Explanation:  Thermal energy is the energy possessed by an object by virtue of its temperature. It is transferred from a hotter object to a colder object till both the bodies attain the same temperature.

Radiation occurs when  thermal energy is transferred by electromagnetic waves. Conduction occurs when thermal energy is transferred when two objects are in direct contact.

Thus Substance W at a temperature of $40^0C$ will transfer thermal energy to substance X at a temperature of $37^0C$ through conduction if they are mixed as they are in direct contact.