The wave lengths for the light of red and blue colours are nearly `7.8xx10^(-7)mand4.8xx10^(-7)m` respectively.
Which colour has the greater speed in a vacuum ?

Explanation

To determine which color has the greater speed in a vacuum, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Speed of Light**:
The speed of light in a vacuum is a constant value, approximately \(3 \times 10^8\) meters per second (m/s). This speed is the same for all colors of light.

2. **Identify the Wavelengths**:
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