The correct spelling of the phrase "study at intensify" is actually "study at intensity." The IPA phonetic transcription for "intensity" is ɪnˈtɛnsɪti. The word is spelled with an "y" sound in the phrase due to a common spelling error. However, the correct spelling includes an "i" in the final syllable. This mistake often occurs because the sound of the letter "y" resembles the "i" sound in the word. Therefore, it is essential to pay close attention to the spelling and pronunciation of words like "intensity."