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The resisntance of the wire in the platinum resistence thermometer at ice point is 5 OHM and at the steam point is 5.25 OHM .When the thermometer is inserted in an unknown hot bathtub its rsistence is found to be 5.5 OHM the temperature of the hot bath tub is. (A) 100 o C (B) 200 o C (C ) 300 o C (D) 350 o C

The resisntance of the wire in the platinum resistence thermometer at ice point is 5 OHM and at the steam point is 5.25 OHM .When the thermometer is inserted in an unknown hot bathtub its rsistence is found to be 5.5 OHM the temperature of the hot bath tub is.
 
(A)    100oC    (B)    200oC    (C )  300oC   (D)  350oC

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Grade:12th pass

1 Answers

Arun
25758 Points
4 years ago
Dear Faiz
 
R0 = 5 ohm
R100 = 5.25 ohm
Rt = 5.5 ohm
alpha = R100 – R0 / (R0 * 100) = Rt – R0 / (R0 * t)
t = 5.5 – 5 / (5.25 – 5) * 100 = 200 degree C

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