The upper and lower fixed points of a faulty mercury thermometer are 2000 F and 300 F respectively. The correct temperature read by this thermometer is

For both the thermometer reading to be same,F-32212-32=R-30200-30 and F=R⇒R-32180=R-30170⇒R=-4 0F

The upper and lower fixed points of a faulty mercury thermometer are 2000 F and 300 F respectively. The correct temperature read by this thermometer is

For both the thermometer reading to be same,F-32212-32=R-30200-30 and F=R⇒R-32180=R-30170⇒R=-4 0F

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The upper and lower fixed points of a faulty mercury thermometer are 200⁰ F and 30⁰ F respectively. The correct temperature read by this thermometer is

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80⁰ F

22⁰ F

-4⁰ F

122⁰ F

answer is C.

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Detailed Solution

For both the thermometer reading to be same,

$\frac{F - 32}{212 - 32} = \frac{R - 30}{200 - 30} and F = R$

$\Rightarrow \frac{R - 32}{180} = \frac{R - 30}{170}$

$\Rightarrow R = - 4^{0} F$

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The upper and lower fixed points of a faulty mercury thermometer are 2000 F and 300 F respectively. The correct temperature read by this thermometer is

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The upper and lower fixed points of a faulty mercury thermometer are 200⁰ F and 30⁰ F respectively. The correct temperature read by this thermometer is