The colour are characterized by which of following character of light-

Options

A. Frequency
B. Amplitude
C. Wavelength
D. velocity

Answer

To solve the question regarding which characteristic of light colors are associated with, we can follow these steps:

### Step 1: Understand the Characteristics of Light
Light can be characterized by several properties, including:
- **Frequency (f)**: The number of oscillations of the wave per second.
- **Wavelength (λ)**: The distance between successive crests of a wave.
- **Amplitude (A)**: The height of the wave, which relates to the intensity or brightness of the light.
- **Velocity (v)**: The speed at which the light wave travels through a medium.

### Step 2: Analyze the Relationship Between These Properties
The relationship between these properties is given by the equation:
\[ v = f \cdot \lambda \]
Where:
- \( v \) is the velocity of light in a medium,
- \( f \) is the frequency,
- \( \lambda \) is the wavelength.

### Step 3: Consider the Effect of Medium on Light
When light travels from one medium to another (e.g., from air to water), its speed changes. This change affects the wavelength but not the frequency:
- The speed of light in water is less than in air, leading to a decrease in wavelength (\( \lambda \)).
- However, the frequency (\( f \)) remains constant because it is determined by the source of the light.

### Step 4: Determine the Role of Frequency in Color Perception
Color perception in humans is primarily determined by the frequency of light:
- Different frequencies correspond to different colors (e.g., red light has a lower frequency than blue light).
- Since the frequency does not change when light enters a different medium, the color of the light remains the same.

### Step 5: Conclude the Answer
Based on the analysis, we conclude that the color of light is characterized by its frequency. Therefore, the answer to the question is:
**Frequency (Option A)**.

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