The total energy of a blackbody radiation source is collected for one minute and used to heat water The temperature of the water in creases from `20^(@)C` to `20.5^(@)C` If the absolute temperature of the blackbody is diubled and the experiment repeated which of the following statements would be most nearly `COR-RECT` ? .

The total energy of a black body radiation source is collected for five minutes and used to heat water. The temperature of the water increases from 10.0^(@) to 1 1.0^(@) . The absolute temperature of the black body is doubled and its surface area halved and the experiment repeated for the same time. Which of the following statements would be most nearly correct ?

The total energy radiated from a block body source at constant temperature is collected for one minute and is used to heata quantity of water. The temperature of water is found to increase from 20^(@)C to 20.5^(@)C . If the absolute temperature of the blackbody is doubled and hte experiment is repeated with the same quantity of water of 20^(@)C , the temperature of water will be:

How much heat energy is necessary to raise the temperature of 5 kg of water from 20 ^@ C " to " 100^@C ?

When 10 g of coal is burnt, it raises the temperature of 2 litres of water from 20^(@)C to 55^(@)C . Calculate the heat of combustion of fuel.

Calculate heat of combustion of coal, when 0.5kg of coal on burning raise the temperature of 50 liters of water from 20^(@)C to 90^(@)C