December 2018 0 98 Report
Cahaya merah memiliki panjang gelombang sekitar 900 nm. jika diketahui cepat rambat gelombang elektromagnetik di udara 3 x 10⁸ m/s, frekuensi cahaya merah adalah ... Hz
a. 3,33 x 10¹⁴
b. 6,67 x 10¹⁴
c 3,33 x 10¹⁵
d. 6,67 x 10¹⁵

tolong dijawab yaa,pake cara
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