The phonetic symbol of the underlined letter in the word 'thin' is

Question

Accepted Answer

The phonetic symbol of the underlined letter in the word 'thin' is correctly represented by Option 2: θ. Here is a detailed explanation supporting this choice:

1. **Explanation for Option 2 (θ):**
   - The word 'thin' begins with the 'th' sound, which is a voiceless dental fricative. In phonetics, this sound is represented by the symbol θ. It is produced by placing the tip of the tongue against the upper teeth and allowing air to pass through, creating a friction sound without vocal cord vibration. This is the characteristic sound of the 'th' in words like 'thin', 'think', and 'theater'.

2. **Explanation for why other options are incorrect:**

- **Option 1 (ð):**
     - The symbol ð represents the voiced dental fricative sound, as in the word 'this' or 'that'. This sound is similar to θ but involves vocal cord vibration. Since 'thin' uses the voiceless version, ð is not the correct symbol.

- **Option 3 (ʒ):**
     - The symbol ʒ represents a voiced postalveolar fricative, as in the word 'measure' or 'vision'. This sound is produced further back in the mouth and involves vocal cord vibration, which is not present in the 'th' sound of 'thin'.

- **Option 4 (dʒ):**
     - The symbol dʒ represents a voiced postalveolar affricate, as in the word 'judge' or 'jam'. This sound is a combination of a stop and a fricative, and it is not related to the 'th' sound in 'thin'.

In conclusion, the correct phonetic symbol for the underlined 'th' in 'thin' is θ, as it accurately represents the voiceless dental fricative sound. The other options do not match the sound characteristics of 'th' in 'thin', making Option 2 the correct choice.