2 kg पदार्थ 500 kJ प्राप्त करता है और 100°C से 200°C तक तापमान परिवर्तन से गुजरता है। प्रक्रिया के दौरान पदार्थ की औसत विशिष्ट ऊष्मा क्या होगी?

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ISRO VSSC Technical Assistant Mechanical 8 Feb 2015 Official Paper
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  1. 5 kJ/(kg°K)
  2. 2.5 kJ/(kg°K)
  3. 10 kJ/(kg°K)
  4. 25 kJ/(kg°K)

Answer (Detailed Solution Below)

Option 2 : 2.5 kJ/(kg°K)
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अवधारणा:

जब Q जूल ऊष्मा को ऐसे निकाय में जोड़ा जाता है जिसका द्रव्यमान m होता है तो तापमान T1 से T2 तक बढ़ जाता है।

यह Q = mc(T2 - T1) द्वारा दिया जाता है, जहाँ c = निकाय की विशिष्ट ऊष्मा होती है।

गणना:

दिया हुआ:

m = 2 kg, Q = 500 kJ, T2 = 200 °C, T1 = 100 °C   

∵ Q = mc(T2 – T1)

⇒ 500 = 2 × c × (200 – 100)

⇒ c = 2.5 kJ/kg°K

Important Points

जब तापमान के अंतर की आवश्यकता होती है तो °C को °K में परिवर्तित न करें।

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