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JAMB Physics 2009 Question 18

Question 18

Temperature and Thermometers

The thermometer whose reading is indicated by a change in colour of its thermometric property is the

  1. A.bi-metallic strip thermometer.
  2. B.thermocouple.
  3. C.platinum resistance thermometer.
  4. D.optical pyrometer.
Show the answer and explanation

Answer: D (optical pyrometer.)

Explanation

An optical pyrometer measures very high temperatures by matching the colour (brightness) of a hot body with a filament.