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One quality of a thermometer is that its...

One quality of a thermometer is that its heat capacity should be small. If P is a mercury thermometer, Q is a resistance thermometer and R thermocouple type then

A

P is best, R worst

B

R is best, P worst

C

R is best, Q wrost

D

P is best, Q wrost

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the quality of thermometers based on their heat capacity, we will analyze each type of thermometer mentioned: mercury thermometer (P), resistance thermometer (Q), and thermocouple (R). ### Step-by-Step Solution: 1. **Understanding Heat Capacity**: Heat capacity is the amount of heat energy required to change the temperature of a substance by one degree Celsius. For thermometers, a smaller heat capacity is desirable because it allows the thermometer to respond quickly to temperature changes. 2. **Analyzing Mercury Thermometer (P)**: - Mercury thermometers are known for their quick response to temperature changes due to the low heat capacity of mercury. - However, compared to other types, it still has a relatively higher heat capacity than thermocouples. 3. **Analyzing Resistance Thermometer (Q)**: - Resistance thermometers operate by measuring the change in electrical resistance of a material with temperature. - They generally have a higher heat capacity because they require more energy to change their temperature compared to mercury thermometers. 4. **Analyzing Thermocouple (R)**: - Thermocouples consist of two different metals joined at one end, which produce a voltage related to temperature difference. - They have a very low heat capacity, allowing them to respond almost instantaneously to temperature changes. 5. **Ranking the Thermometers**: - Based on the analysis: - **Best**: Thermocouple (R) - it has the lowest heat capacity. - **Second Best**: Mercury Thermometer (P) - it has a moderate heat capacity. - **Worst**: Resistance Thermometer (Q) - it has the highest heat capacity. ### Conclusion: - The best thermometer for low heat capacity is the **thermocouple (R)**. - The worst thermometer in terms of heat capacity is the **resistance thermometer (Q)**.
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