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दो तारे X और Y क्रमशः 4800 `Å` व 6000 `Å` तरंगदैर्घ्य पर अधिकतम विकिरण उत्सर्जित करते है। यदि तारे Y का तापमान 5800 K हो,तारे तो तारे X का तापमान क्या होगा?

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वीन के विस्थापन नियम से
`" " lambdamT=`नियतांक
जहाँ T तारे (कृष्णिका ) का परम् ताप तथा `lambdaT` वह तरंगदैध्र्य है जिस पर अधिकतम विकिरण उत्सर्जित होता है।
तारे X के लिए `" " lambda m=4800Å` तथा T =?
तारे Y के लिए : `" " lambda m=6000Å`तथा `T=5800K.`
इस प्रकार `4800ÅxxT =6000Åxx5800K `
अथवा `" " T =(6000Åxx5800K ) /( 4800K ) =7250K.`

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