Will rate 5 star immediatley for right answer, Need answer for both question, At

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Will rate 5 star immediatley for right answer, Need answer for both question,

At 43.8 degree C, the resistance of a segment of gold wire is 130.1 ohm. When the wire is placed in a liquid bath, the resistance decreases to 96 ohm. What is the temperature of the bath? The temperature coefficient of resistivity for gold is 0.0034 ( degree C)-1 at 20 degree C. Answer in units of degree C A platinum resistance thermometer has a resistance of 200 when placed in an ice 0 degree C bath and 221.2 ohm when immersed in a crucible containing a melting substance. What is the melting point of the substance? The temperature coefficient of the platinum is 0.00392 ( degree C)-1. The resistor was calibrated at a temperature of 20 degree C.

Explanation / Answer

1)

Resistance = R(initial)[1+ alpha (T(final) - T(initial)]

96= 130.1 [1+ 0.0034(T(final) - 43.8]

T(final)= -33.89 C

2)

Resistance of metals reduces with temperature.

R(T) = R? [ 1 + ? T ]

221.2 = 200 [ 1 +0.00392 T ]

T ( melting point) = 26.91 C

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