In Hangul, the "ka" sound is represented by the character "가" (ga). This character is composed of two parts, a consonant and a vowel. The consonant is "ㄱ" (g), which is not entirely silent, but it is unaspirated. This means that it is not pronounced with a strong puff of air like the English "k" sound, but rather as a softer sound similar to the Spanish or Italian "g".

The reason why the "ka" sound starts with a consonant that is not aspirated is due to the phonetic features of the Korean language. Korean has a distinction between aspirated and unaspirated consonants, which are considered separate phonemes. The unaspirated consonants, including "ㄱ" (g), are pronounced with less force than the aspirated ones, such as "ㅋ" (k). This distinction is important in Korean because it can change the meaning of words.

Furthermore, the Korean language tends to have syllables with a consonant-vowel structure, where the consonant acts as the onset of the syllable and the vowel is the nucleus. Therefore, the "ka" sound in Korean must start with a consonant, and "ㄱ" (g) is the most suitable consonant to represent it, given its unaspirated nature and phonetic features.
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