13. A platinum wire is used to determine the melting point of an unknown metal. The resistance of the platinum wire is 2.000 Q at 20 °C and increases to 3.072 N as the metal starts to melt. What is the melting point of the metal? (The temperature coefficient of resistivity of platinum is 3.9 × 103 /°C.) (a) 117 °C (b) 137 °C (c) 157 °С (d) 273 °C (е) 351°C
13. A platinum wire is used to determine the melting point of an unknown metal. The resistance of the platinum wire is 2.000 Q at 20 °C and increases to 3.072 N as the metal starts to melt. What is the melting point of the metal? (The temperature coefficient of resistivity of platinum is 3.9 × 103 /°C.) (a) 117 °C (b) 137 °C (c) 157 °С (d) 273 °C (е) 351°C
Related questions
Question
how is the answer e?
Transcribed Image Text:13.
A platinum wire is used to determine the melting point of an unknown metal. The resistance of the
platinum wire is 2.000 2 at 20 °C and increases to 3.072 Q as the metal starts to melt. What is the melting
point of the metal? (The temperature coefficient of resistivity of platinum is 3.9 × 103 °C.)
(a) 117 °C (b) 137 °C
(c) 157 °C
(d) 273 °C
(e) 351 °C
Expert Solution
Step 1
Given, resistance at 20 °C = Ro = 2.000
temperature To = 20 °C
resistance at T °C = RT = 3.072
temperature = T = ?
Step by step
Solved in 2 steps with 1 images
