Three thermometers are used to measure the temperature inside a close, insulated

Question

Three thermometers are used to measure the temperature inside a close, insulated box. Thermometer A is calibrated in Fahrenheit degrees, thermometer B in Celsius degrees, and thermometer C in Kelvin. When the thermometers reach thermal equilibrium with the interior of the box, B reads -40 degrees celsius and C reads 233 K. Which of the following statements is necessarily true?

a) Thermometer C should read -233 K

b) Thermometer A must read -40 degrees F

c) If the temperature of the interior of the box is increased until A reads -20 degrees F, thermometer B will read -10 degrees C

d) Thermometer B should read -77 degrees C

e) If the temperature of the interior of the box is increased until C reads 293 K, thermometer A will read 36 degrees F

Explanation / Answer

Since 233K= -40 Celsius,

Using Fahrenheit= Celsius*9/5 + 32 = -40*9/5 + 32= -40Fahrenheit. So, b) Thermometer A must read -40 degrees F

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