Jawaban:

perbandingan daya radiasi lampu pertama terhadap lampu ke dua adalah 81 : 64

Pembahasan

begin mathsize 14px style T subscript 1 equals 300 space straight K T subscript 2 equals 400 space straight K r subscript 1 equals 2 r subscript 2 Ditanya colon space P subscript 1 space colon space P subscript 2 equals... end style

begin mathsize 14px style P subscript 1 over P subscript 2 equals fraction numerator e sigma A subscript 1 T subscript 1 to the power of 4 over denominator e sigma A subscript 2 T subscript 2 to the power of 4 end fraction equals fraction numerator pi r subscript 1 squared T subscript 1 to the power of 4 over denominator pi r subscript 2 squared open parentheses T subscript 2 close parentheses to the power of 4 end fraction equals fraction numerator r subscript 1 squared T subscript 1 to the power of 4 over denominator r subscript 2 squared open parentheses T subscript 2 close parentheses to the power of 4 end fraction equals open parentheses 2 r subscript 2 close parentheses squared over r subscript 2 squared open parentheses 300 over 400 close parentheses to the power of 4 equals 4 open parentheses 3 over 4 close parentheses to the power of 4 equals 81 over 64 end style

Jadi, perbandingan daya radiasi lampu pertama terhadap lampu ke dua adalah 81 : 64