Measure the temperature of the following :
Take (i) a beaker full of water, (ii) a beaker full of soil/sand and (iii) a closed bottle containing a thermometer. Keep them in bright Sunlight for three hours. Now measure the temperature of all 3 vessels. Also, take the temperature reading in shade at the same time.
Now answer
1. Is the temperature reading more in activity (i) or (ii)?
2. Based on the above finding, which would become hot faster – the land or the sea?
3. Is the thermometer reading of the temperature of air (in shade) the same as the temperature of sand or water? What do you think is the reason for this? And why does the temperature have to be measured in the shade?
4. Is the temperature of air in the closed glass vessel/bottle the same as the temperature taken in open air? (i) What do you think is the reason for this? (ii) Do we ever come across this phenomenon in daily life?
As we have seen above, sand and water do not heat up at the same rate. What do you think will be their rates of cooling? Can we think of an experiment to test the prediction?
Answers
1. The temperature reading more in the activity (ii) than in the activity (i). This is because soil or sand gets heated up quickly by the solar radiations than water.
2. Based on the above finding, the land becomes hot faster than the sea.
3. The temperature of air in shade is different from the temperature of soil or water in sunlight. This is because of the direct effect of radiations when kept in direct sunlight. The temperature should be measured in the shade because the direct solar radiations affect the thermometer reading making it non-uniform.
4. The temperature of air in the closed glass bottle is more than the temperature taken in the open air. This is because of the greenhouse effect. The solar radiations enter the glass bottle through the walls but they cannot pass out. So, they heat up the air inside the closed bottle. This phenomenon of the greenhouse effect is common in everyday life. Ex. A car parked in sun gets heated from inside due to this greenhouse phenomenon.
5. The heating and cooling capacity of sand is quicker than that of water. This is because water has high specific heat capacity than sand.
Answer:
the answer is attached pls refer to the same
