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in Physics by (121k points)
एक गोलाकार कृष्णिका जिसकी त्रिज्या 12 सेमी 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 में विकरित शक्ति होगी-
A. 225
B. 450
C. 900
D. 1800

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