Read the following statements and choose the correct answer. for them.

1) Thermo emf depends on the nature of metals and temperature of junctions.
2) By a thermoelectric thermometer we can measure the temperature of the sun.

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Both A and B are true

Both A and B are false

A is true but B is false

A is false B is true

answer is C.

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Detailed Solution

Concept- Check whether the first statement is true or false before moving on to the second; after checking and comparing, write your final answer.
Statement A is correct: Thermo emf is affected by the nature of the metals and the temperature of the junctions. When the temperature difference between the two junctions of a thermocouple changes, the emf produced between them is known as thermo emf, and this thermo emf changes with the change in temperature difference, as well as for dissimilar metals.
Statement B is false: We cannot measure the temperature of the sun using a thermoelectric thermometer. To measure extremely high temperatures, such as the temperature of the sun, a radiation thermometer or pyrometer can be used. The seebeck effect governs the operation of a thermoelectric thermometer.
As a result, statement A is correct but statement B is incorrect.
Hence, option 3 is the correct answer.

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