Question

Your finger sticks to an ice tray just taken form the refrigerator. Which factor has more effect on this phenomenon?
1. The inside temperature of the freezer
2. The humidity of the air
3. The heat capacity of both your finder and the tray
4. The thermal conductivity of the tray

Answer 1

Correct Answer - Option 4 : The thermal conductivity of the tray

Concept:

• Heat is transferred between a system and its environment when its temperature differs.
• When we touch the ice tray, heat is transferred from our finger to the ice. 
• Energy is transferred by thermal conduction.
• When you touch the ice tray, heat will transfer from your finger to the bit of ice and the ice melts results in a thin film of water between the finger and the tray.
• Again the water film will freeze because the tray is so cold. Thus an icy bond will create in between the tray and your finger.
• That is the reason, your finger sticks to an ice tray just taken from your refrigerator.