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एक गोलाकार कृष्णिका जिसकी त्रिज्या 12 सेमि है,500 K ताप पर 450 W शक्ति विकरित करती है।यदि त्रिज्या को आधा कर दिया जाये तथा ताप दोगुना कर दिया जाये,तो वाट मैं विकरित शक्ति होगी:
A. ` 225`
B. `450`
C. ` 900`
D. ` 1800`

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Correct Answer - d
कृष्णिका से विकरित शक्ति `prop ` `(T^(4) xxA)` जहाँ T कृष्णिका का परम ताप तथा A पृष्ट-क्षेत्रफल है।

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