Diameter of a Table Tennis ball is :

Question

Accepted Answer

The diameter of a standard table tennis ball is 40 mm, which aligns with Option 4. This specification is set by the International Table Tennis Federation (ITTF), the governing body for the sport. The ITTF established this standard to ensure uniformity and fairness in the game, as the size of the ball can significantly affect its bounce, speed, and overall playability.

1. **Explanation for Option 4 (40 mm):**
   - The ITTF regulations specify that the diameter of a table tennis ball must be 40 mm. This standard was adopted in the year 2000, replacing the previous standard of 38 mm. The change was made to slow down the game slightly and make it more spectator-friendly. The 40 mm ball is now universally used in all official competitions and is recognized as the standard size for table tennis balls worldwide.

2. **Explanation for why other options are incorrect:**
   - **Option 1 (42 mm):** A diameter of 42 mm is larger than the ITTF standard. A ball of this size would not be approved for official play as it would alter the dynamics of the game, making it slower and potentially affecting the spin and control players can exert.
   - **Option 2 (39 mm):** A diameter of 39 mm is smaller than the current standard. While it is closer to the previous standard of 38 mm, it still does not meet the current ITTF regulations. A ball of this size would be faster and could lead to a different style of play, which is not in line with the current rules.
   - **Option 3 (38 mm):** This was the standard diameter before the year 2000. However, it is no longer the correct size according to current ITTF regulations. The change to 40 mm was made to enhance the sport's appeal and ensure consistency in play.

In conclusion, Option 4 is the correct answer because it adheres to the official standards set by the ITTF, ensuring that all table tennis balls used in competitions are uniform in size, thereby maintaining the integrity and consistency of the sport.