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Question

A new temperature scale uses X as a unit of temperature, where the numerical value of the temperature tx in this scale is related to the absolute temperature T by tx=3T+300. If the specific heat of a material using this unit is 1400Jkg−1K−1 its specific heat in the S.I. system of units is :

A
4200Jkg1K1
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B
1400Jkg1K1
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C
466.7Jkg1K1
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D
impossible to determine from the information provided
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Solution

The correct option is A 4200Jkg1K1
tx=3T+00
If in SI system the temperature has to be changed by one unit then in the given side the temperature has to be changed by three units .
Thus the specific heat which is the heat required to change the temperature of the body by 1 unit will be changed on the other side by 3 units.
So specific heat in SI scale =3(1400)=4200J/KgK

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