Question

40 tom prepared a turkey at room temperature and heated the oven to 160 °c. he placed the turkey in the oven to cook. after the turkey was cooked for two hours, he inserted a thermometer into the turkey to check the temperature as shown.
(a) state the temperature shown on the thermometer. 1
(b) state why the temperature of the turkey is not 160 °c even after two hours in the oven. 1

Explanation:

Part (a)

Step1: Analyze the thermometer scale

The thermometer scale shows markings from 50 to 100 °C. The pointer is at 70 °C (checking the scale, each major division or the pointer's position indicates 70 °C).

Heat transfer between the oven (at \( 160^\circ\text{C} \)) and the turkey (initially at room temperature) takes time. Also, the turkey has mass and specific heat, so it can't instantly reach the oven's temperature. Heat transfer (conduction, convection) is a gradual process, and the turkey's temperature rises until thermal equilibrium is approached, but since it's still cooking, it hasn't reached \( 160^\circ\text{C} \) yet (or due to heat capacity, heat loss, etc.). A concise reason: Heat transfer from the oven to the turkey is not instantaneous; the turkey needs time to absorb heat, and its temperature rises gradually (or thermal equilibrium hasn't been reached, or the turkey has a heat capacity so it doesn't reach the oven's temp immediately).

Answer:

\( 70^\circ\text{C} \)

Part (b)