1. Complete Activity 3.1 (Page 24). Take three small tubs/containers. Label them as A, B and C. Put cold water in container A and hot water in container B. Mix some cold and hot water in container C. Now dip your left hand in container A and the right hand in container B. After keeping the hands in the two containers for 2–3 minutes, put both the hands simultaneously in container C (Fig. 3.1). Do both the hands get the same feeling?
Answer:
The above activity can be carried out as follows:Aim: To note how each hand feels when put simultaneously in container Cand provide an explanation.
Materials Required: Three small containers, cold water, hot water.
Procedure:
Refer to the figure below:
(i) Put cold water in container A and hot water in container B. Mix some cold and hot water in container C.
(ii) Now dip your left hand in container A and dip your right hand in container B.
(iii) After keeping both hands soaked for 2-3 minutes in both the containers, put both hands simultaneously in container C.
Observation:
You will find that judging by your left hand the water will feel hot and judging by your right hand the water will feel cold.
Conclusion:
When the left hand was soaked in container A with cold water, there was heat flow by conduction from warmer hand to cold water. Hence, the hand felt cold. Then when the cold left hand was dipped in Container C with room temperature water, there was conduction from the warmer water to the cooler hand. Hence, the left hand felt warm.
When the right hand was soaked in container B with hot water, there was heat flow by conduction from hot water to hand. Then when the hot right hand was dipped in Container C with room temperature water, there was conduction from the warmer hand to the cooler water. Hence, the right hand felt cold.
“1. Complete Activity 3.1 (Page 24). Take three small tubs/containers. Label them as A, B and C. Put cold water in container A and hot water in container B. Mix some cold and hot water in container C. Now dip your left hand in container A and the right hand in container B. After keeping the hands in the two containers for 2–3 minutes, put both the hands simultaneously in container C (Fig. 3.1). Do both the hands get the same feeling?” – Solved
Related Links:
Solution to Extended Learning Problem 1
Solution to Extended Learning Problem 2
Solution to Extended Learning Problem 3
Solution to Extended Learning Problem 4
Solution to Extended Learning Problem 5
Solution to Activity 3.2
Solution to Activity 3.3
Solution to Activity 3.4
Solution to Activity 3.5
Solution to Activity 3.6
Solution to Activity 3.7
Solution to Activity 3.8
Solution to Activity 3.9
Solution to Activity 3.10
Solution to Activity 3.11
Solutions to Chapter 3 Heat
