Korean · Pronunciation Guide
One syllable, 'baek', ending in a ㄱ that stops dead without releasing. The vowel is the flat a of 'bat', not the ay of 'bake'.
baek
Nothing here needs emphasis -- it is a single clipped syllable, and in practice it is glued straight onto a counter or another numeral, as in 백 원 or 삼백, where that final stop starts tensing whatever follows it.
Listen: 백
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이 책은 백 페이지예요.
I chaegeun baek peijiyeyo.
This book is a hundred pages.
Listen: 이 책은 백 페이지예요.
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이 책은 백 페이지예요 sets 백 immediately before 페이지, and the unreleased k links into the aspirated ㅍ with no gap. Earlier in the sentence 책은 shows the mirror-image process, the ㄱ of 책 hopping into 은 and voicing to give chae-geun.
The romanization invites an English 'bake', with a long diphthong and a released k. Both halves are wrong: ㅐ is a short, flat front vowel, and the final consonant is a silent closure. Say 'bak' as in 'back', stop the tongue at the roof of the mouth, and never let the k pop.