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The lower and upper fixed points marked on a mecury-in-gl...

The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?

A.

55.3oC

B.

23.3oC

C.

49.0oC

D.

16.1oC

E.

76.7oC

Correct answer is B

210mm .... 100oC

49mm .... θ

0mm .... 0oC

4902100 = θ01000

49210 = θ100

θ = 23.3oC