Correct Answer - Option 4 : double vowel sounds
The vowel is a sound that can be produced without the assistance of any other. The word "diphthong" comes from Greek and means "two voices" or "two sounds." In phonetics, a diphthong is a vowel in which there is a noticeable sound change within the same syllable.
- A diphthong is a sound formed by the combination of two vowels in a single syllable, in which the sound begins at one vowel and moves towards another (as in coin, loud, and side).
- A diphthong is the union of two vowels in one sound or syllable.
- Diphthong can also be defined as “A union of two vowel sounds occurring consecutively and pronounced simultaneously”.
- There are four common diphthongs i.e. ‘I’, ‘OW’, ‘OI’, and ‘U’ as heard in the sentence ‘I now enjoy music’.
- Two vowel sounds are pronounced simultaneously. They are expressed by three angular signs and a semi-circle.
Thus, it is concluded that Diphthongs are double vowel sounds.