Question

during a sunny day, sand at the beach becomes very hot, when you step on it barefoot and feel the intense heat, the heat moves to your feet by - radiation convection conduction evaporation question 8 1 pts when sunlight warms earths surface, and the warm ground then heats the air directly above it, which two heat transfer processes are happening? radiation followed by conduction convection followed by radiation conduction followed by convection radiation followed by convection

Explanation:

• First question: Heat transfer by conduction occurs when there is direct contact between two objects (sand and feet here). Radiation is heat transfer via electromagnetic waves (like sunlight). Convection is heat transfer via fluid (liquid or gas) movement. Evaporation is a phase - change process (liquid to gas). Since feet are in direct contact with sand, it's conduction.
• Second question: Sunlight (electromagnetic waves) warms Earth's surface - this is radiation. Then, the warm ground (solid) heats the air (gas) directly above it (contact), which is conduction. But when the heated air rises (due to being less dense), convection also comes into play. However, the initial heating of the ground is radiation and then the direct heating of air (contact) is conduction.

Answer:

1. conduction
2. Radiation followed by conduction