Monday

November 24, 2014

November 24, 2014

Posted by **Ella** on Tuesday, November 20, 2012 at 1:06pm.

in a 0 degrees Celsius ice bath and 253.8 ohms when immersed in a crucible contacting melting potassium. What is the

melting point of potassium? Hint: First determine the resistance of the platinum resistance

thermometer at room temperature, 20 degrees Celsius.

- university physics -
**Elena**, Tuesday, November 20, 2012 at 3:39pmfor Pt α =0.00392 (1/℃).

R₁=R₀[1+α(T₁-T₀)]

R₂= R₀[1+α(T₂-T₀)]

R₁/R₂=[1+α(T₁-T₀)]/[1+α(T₂-T₀)]

200/253.8=(1- 0.00392 •20)/[1+ 0.00392• (T₂-20)]

Solving for T₂ gives

T₂=63.2℃

**Answer this Question**

**Related Questions**

physics - Pls help me with this, The resistance of a platinum resistance ...

physics - The resistance of a platinum resistance thermometer is 30 ohms at the ...

physics - The resistance of a platinum resistance thermometer is 30 ohms at the ...

Algebra 2 - two resistors are connected in parallel. Their resistances are 8 ...

Algebra 2 - two resistors are connected in parallel. Their resistances are 6 ...

Engineering Science (Physics) - A platinum coil has a resistance of 3.146(ohms) ...

science - there are three sources of resistance in a parallel ciruit. Two of ...

Science - There Are Three Resistance In A Parallel Circuit. Two Of Them Are ...

physics - Resistors R1, R2, and R3 have resistances of 15.0 Ohms, 9.0 Ohms and 8...

physics - a metal wire has a resistance of 8 Ohms at a temperature of 20 degrees...