The thermometer whose reading is indicated by a change in color of its thermometric property is the?
A
bi-metalic strip thermometer
B
thermocouple
C
platinium resistance thermometer
D
optical pyrometer
Verified Correct Answer: D.
Physical Principles & Numerical Solution
A pyrometer is instrument for measuring high temperature.
The optical pyrometer is one in which the luminous radiation from the hot body is compared with that from a known source.
Source: WAEC / JAMB / NECO Classroom Archive (Record #14158)