Verified Solution • 2025–26 Session moderate

QJEEM19Phe060: JEE Main 2019 Physics - Class 11 JEEM19Phe060 Solution: An unknown metal of mass 192 g heated to a temperature of 100 o …

An unknown metal of mass 192 g heated to a temperature of 100oC was immersed into a brass calorimeter of mass 128 g containing 240 g of water at a temperature of 8.4oC. Calculate the specific heat of the unknown metal if water temperature stabilizes at 21.5oC. (Specific heat of brass is 394 J kg–1 K–1)

Multiple Choice Options

  • A 458 J kg–1 K–1
  • B 1232 J kg–1 K–1
  • C 654 J kg–1 K–1
  • D 916 J kg–1 K–1

Step-by-Step Verified Solution

192 ×\times S ×\times (100 −- 21.5)

= 128 ×\times 394 ×\times (21.5 −- 8.4)

       + 240 ×\times 4200 ×\times (21.5 −- 8.4)

⇒\Rightarrow    S = 916

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