Red light differs from blue light in its

Options

A. Speed
B. Frequency
C. Intensity
D. Amplitude

Answer

To solve the question regarding how red light differs from blue light, we can follow these steps:

### Step 1: Understand the Properties of Light
Light is an electromagnetic wave characterized by its speed, frequency, wavelength, and amplitude. The speed of light in a vacuum is constant for all colors of light.

### Step 2: Identify the Wavelengths of Red and Blue Light
- Red light has a wavelength range of approximately 620 nm to 750 nm.
- Blue light has a wavelength range of approximately 450 nm to 495 nm.

### Step 3: Relate Wavelength to Frequency
The frequency (ν) of light is inversely related to its wavelength (λ) through the equation:
\[ ν = \frac{v}{λ} \]
where \( v \) is the speed of light (approximately \( 3 \times 10^8 \) m/s).

### Step 4: Compare the Frequencies
Since the speed of light is constant, we can see that:
- A longer wavelength (like that of red light) corresponds to a lower frequency.
- A shorter wavelength (like that of blue light) corresponds to a higher frequency.

### Step 5: Conclusion
From the above analysis, we can conclude that red light has a lower frequency than blue light. Therefore, the correct answer to the question is that red light differs from blue light in its frequency.

### Final Answer
Red light differs from blue light in its frequency.

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