On January 22, 1943, in Spearfish, South Dakota, the temperature rose from −4.00°F to 45.0°F over the course of two minutes (the current world record for the fastest recorded temperature change). By how much did the temperature change on the Celsius scale?

The change on the Celsius scale is 27.22 °C.

Explanation:

The conversion of Fahrenheit to Celsius is the following:

So, we need to convert T₁ and T₂ from °F to °C:

Hence, the change on the Celsius scale is:

Therefore, the change on the Celsius scale is 27.22 °C.

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wavelength divides in half and speed stays the same.