Thermocouple Thermometer Characteristics

Steps:

• Recall that a thermocouple uses the Seebeck effect, where two dissimilar metals generate voltage from temperature differences.
• Determine temperature range: thermocouples handle up to 2000°C, suitable for very high temperatures.
• Assess response time: direct metal junction allows rapid heat conduction, enabling quick response to changes.
• Compare to options: only D affirms both properties.

Why D is correct:

• Thermocouples measure high temperatures via Seebeck effect (voltage proportional to ΔT) and respond quickly due to low thermal mass.

Why the others are wrong:

• A: Falsely denies both; thermocouples excel in high temperatures and fast response.
• B: Denies high-temperature capability, but they routinely measure up to 2000°C.
• C: Denies quick response, but their design ensures near-instantaneous detection.

Final answer: D