A Centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is loweres until the Fahrenheit thermometer registers `140^(@)`. What is the fall in temperature as registered by Centigrade thermometer ?

Options

A. `30^(@)`
B. `40^(@)`
C. `60^(@)`
D. `80^(@)`

Answer

B

Explanation

`(DeltaT_(c))/(100)=(DeltaT_(F))/(180)=(212-140)/(180)`
i.e., `" "DeltaT_(c)=100xx(72)/(180)=40^(@)C`
`therefore` Fall temperature `= 40^(@)C.`