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Answer :
40°C is the fall in temperature in Celsius scale. Option A is correct choice.
The conversion formula between Celsius and Fahrenheit scales,
F = (9/5)*C + 32
where F is the temperature in Fahrenheit and C is the temperature in Celsius.
Let's assume that the boiling point of water is 100°C in the Celsius scale and 212°F in the Fahrenheit scale. When the thermometers are dipped in boiling water,
Fahrenheit thermometer: F = 212°F
Celsius thermometer: C = 100°C
The temperature of the water until the Fahrenheit thermometer registers a fall of 72°F,
F = 212°F - 72°F = 140°F
Use the conversion formula,
C = (5/9)(F - 32) = (5/9)(140°F - 32) = 60°C
Therefore, the fall in temperature in Celsius scale is,
100°C - 60°C = 40°C
Answer is (a) 40°C.
To know more about the Celsius, here
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