A spoon heated by a bowl of hot soup is an example heat transfer by?

The spoon heated by a bowl of hot soup is an example of heat transfer by conduction.

Here's why:

* Conduction is the transfer of heat through direct contact between substances. The hot soup molecules are vibrating rapidly. When the spoon touches the soup, these vibrating molecules transfer some of their energy to the spoon's molecules, causing them to vibrate faster and making the spoon feel warmer.

Let's look at why the other heat transfer methods don't apply:

* Convection involves the transfer of heat through the movement of fluids (liquids or gases). While the soup itself might be transferring heat through convection, the spoon's heating is primarily due to direct contact with the soup.

* Radiation involves the transfer of heat through electromagnetic waves. While a hot soup might radiate some heat, the spoon's heating is primarily due to the contact with the soup.