A platinum resistance thermometer records 3.0 $\Omega$ at 0^oC and 8.0 $\Omega$ at 100^oC. If it records 6.0 $\Omega$ in a certain environment, The temperature of the medium is

80^oC

60^oC

50^oC

30^oC

Correct answer is B

8 $\Omega$ .....100^oC

6 $\Omega$ ..... $\theta$ ^oC

3 $\Omega$ .....0^oC

$\frac{6 - 3}{8 - 3}$ = $\frac{\theta - 0}{100 - 0}$

therefore, $\theta$ = 60^oC

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