what is the temperature in degrees Celsius of a substance with a temperature of 49K A -322 degrees C , B -224 degrees C , C 224 degrees C , D 322 degrees C

B. -224 degrees C

Explanation:

The kelvin is the base unit of temperature in the International System of Units (SI). It's marked by the symbol K. This unit is used to express the absolute zero - the temperature at which a thermodynamic system has the lowest energy. The absolute zero is zero kelvins, or - 273.15 degrees Celsius and - 459.67 Fahrenheit. It's thought to be the coldest temperature possible and as far as we know, nothing has reached it.

To convert kelvins into degrees Celsius, you need to subtract 273.15 from  the temperature expressed in kelvins:

The solution:

This is why the correct option is B.