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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 1400 J kg1 X1 its specificne in the S.I. system of units is

A
4200 J kg1 K1
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B
1400 J kg1 K1
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C
466.7 J kg1 K1
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D
impossible to determine from the information provided
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Solution

The correct option is A 4200 J kg1 K1
tx=3T+300Q=msΔ0
Δtx=3ΔT
S=QmΔθS=QmΔθ
Since, unit of 8 is joule in both system
X T
m=m0kg m0kg
Q=Q0J Q0J
Δtx ΔT
Sx=Q0m0Δtx=1400Sr=Q0m0ΔT=3Qm0Δtx
Sr=3×1400=4200Jkg1K1

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