反应时间估算器 — 公式
## How the Ruler Drop Test Works
### Formula
**Reaction Time = sqrt(2 x Distance / g)**
Where distance is in meters and g = 9.81 m/s^2. The result is in seconds; multiply by 1000 for milliseconds.
### How to Perform the Test
1. Have a partner hold a ruler vertically at the 0 cm mark between your open thumb and finger.
2. Without warning, the partner drops the ruler.
3. Catch it as quickly as possible and read the cm mark where you caught it.
### Benchmarks
| Reaction Time | Rating |
|--------------|--------|
| < 150 ms | Excellent |
| 150-200 ms | Good |
| 200-250 ms | Average |
| 250-300 ms | Below average |
| > 300 ms | Slow |
### Formula
**Reaction Time = sqrt(2 x Distance / g)**
Where distance is in meters and g = 9.81 m/s^2. The result is in seconds; multiply by 1000 for milliseconds.
### How to Perform the Test
1. Have a partner hold a ruler vertically at the 0 cm mark between your open thumb and finger.
2. Without warning, the partner drops the ruler.
3. Catch it as quickly as possible and read the cm mark where you caught it.
### Benchmarks
| Reaction Time | Rating |
|--------------|--------|
| < 150 ms | Excellent |
| 150-200 ms | Good |
| 200-250 ms | Average |
| 250-300 ms | Below average |
| > 300 ms | Slow |
计算示例
The ruler fell 15 cm before being caught.
- Distance in meters = 15 / 100 = 0.15 m.
- Reaction time = sqrt(2 x 0.15 / 9.81) = sqrt(0.0306) = 0.175 sec.
- In milliseconds = 175 ms.
- Rating: Good (150-200 ms range).