Frekuensi gelombang sinar merah 4,4.1014 Hz. Cepat rambat di udara 3.108 m/s.Berapakah panjang gelombang sinar merah dalam air (nair​=34​)

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Frekuensi gelombang sinar merah begin mathsize 14px style 4 comma 4.10 to the power of 14 space Hz end style. Cepat rambat di udara begin mathsize 14px style 3.10 to the power of 8 space straight m divided by straight s end style.Berapakah panjang gelombang sinar merah dalam air begin mathsize 14px style open parentheses n subscript a i r end subscript equals bevelled 4 over 3 close parentheses end style 

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R. Sobirin

Master Teacher

Mahasiswa/Alumni Universitas Indonesia

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Pembahasan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight lambda equals cell straight v over straight f end cell row straight lambda equals cell fraction numerator 3 cross times 10 to the power of 8 over denominator 4.4 cross times 10 to the power of 14 end fraction end cell row straight lambda equals cell 0 comma 68 cross times 10 to the power of negative 6 end exponent space straight m end cell row blank blank blank row cell straight n subscript 1 cross times straight lambda subscript 1 end cell equals cell straight n subscript 2 cross times straight lambda subscript 2 end cell row cell 1 cross times 0 comma 68 cross times 10 to the power of negative 6 end exponent end cell equals cell 4 over 3 cross times straight lambda subscript 2 end cell row cell straight lambda subscript 2 end cell equals cell fraction numerator 3 cross times 0 comma 68 cross times 10 to the power of negative 6 end exponent over denominator 4 end fraction end cell row cell straight lambda subscript 2 end cell equals cell 0 comma 51 cross times 10 to the power of negative 6 end exponent space straight m end cell end table end style 

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