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)

To determine the temperature on the thermometer, we look at the scale. The thermometer is marked in °C, and the pointer is at 70 °C (since the scale shows intervals, and the pointer aligns with 70).

Heat transfer between the oven (at 160 °C) and the turkey takes time. Also, the turkey has a large mass, so it takes time to reach thermal equilibrium with the oven. Or, heat transfer occurs until the turkey's temperature approaches the oven's, but it may not reach it fully in two hours due to thermal inertia, heat loss to the surroundings, or the time needed for conduction/convection to heat the entire turkey. A simpler reason is that the turkey is a good insulator (or has low thermal conductivity), so heat takes time to spread throughout, and it hasn't reached the oven's temperature yet.

Answer:

70 °C

Part (b)