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100 கிராம் வெள்ளித் தொகுதிக்கு அதன் வெப்பநிலையை 40 டிகிரி செல்சியஸ் உயர்த்த எவ்வளவு வெப்பத்தை கடத்த வேண்டும்? (வெள்ளியின் தன் வெப்பம் 236 Jkg-1K-1)

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  1. 450 J 
  2. 1270 J 
  3. 944 J 
  4. 1988 J 

Answer (Detailed Solution Below)

Option 3 : 944 J 
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Detailed Solution

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கருத்து:

வெப்ப ஏற்பு திறன்:

  • அதன் வெப்பநிலையை ஒரு டிகிரியால் மாற்றுவதற்கு தேவையான வெப்பத்தின் அளவு என வரையறுக்கலாம்.
  • கணித ரீதியாக, வெப்பம் தேவை, Q = mcΔT,
  • m = நிறை, c = தன் வெப்ப திறன், ΔT = வெப்பநிலை வித்தியாசம்
  • வெப்பத்தை ஜூல் (J) இல் அளவிடலாம்.

கணக்கீடு:

கொடுக்கப்பட்டவை: நிறை, m = 100 கி = 0.1 கிகி, வெப்பநிலை வித்தியாசம், ΔT = 40ºC, வெள்ளியின் தன் வெப்பம், c = 236 J/ kg K

தேவைப்படும் வெப்பம், Q = mcΔT

Q = 0.1 × 236 × 40

Q = 944 J

எனவே, ஒரு தன் வெப்பநிலையை உயர்த்த தேவையான ஆற்றல் 944 J ஆகும்.

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