Two identical mercury thermometers are placed in a cold room. The bulb of one thermometer is coated with lamp black and that of the other is painted white. Now they are exposed to sunlight simultaneously. In which thermometer, the change in temperature will be fast? class 11

Open in App

Solution

The bulb of thermometer which is coated with lamp black, the change in temperature will be fast. Due to it's body is black and hence it absorbs all the radiation falling on it. Therefore it's became hot earlier.

Suggest Corrections

Similar questions

Q. Two laboratory thermometers are marked as 'A' and 'B'. The bulb of thermometer 'A' is wrapped in a white cloth and that of thermometer 'B' in black cloth. Both the thermometers are placed in sunlight for an hour. After one hour:

Two mercury thermometers are constructed such that one has a spherical bulb and the other an elongated cylindrical bulb of same volume. Which will respond quickly to temperature changes?

Q. Graph in figure shows the variation in density of a liquid substance with temperature. It can be seen that density of this substance is minimum at temperature

T_{C}

. This liquid is used as a thermometer fluid in bulb of a thermometer and two such identical thermometers are used to measure temperature of two bodies A and B which are at temperature

T_{1}

and

T_{2}

. Now in an isolated system A and B are brought in contact so that they will be in thermal equilibrium. Which of the following statements is are correct.

Q. Two thermometers are constructed in the same way except that one has a spherical bulb and the other a cylindrical bulb; which one will respond quickly to temperature changes?

Q. (a) Two identical vessels A and B containing equal volume of water are placed in sun. The outer surface of one vessel A is blackened, while of other vessel B is polished. Thermometer

T_{1}

and

T_{2}

are used to measure the temperature of vessel A and B respectively. Which thermometer will record a higher temperature? Give a reason for your answer.
(b) If the two vessels A and B as described in part (a) are filled with boiling water and placed inside the room, which thermometer will show a higher temperature after 15 minutes? Give a reason for your answer.

Join BYJU'S Learning Program