Question

In visible light, red colour possesses

• A. high wavelength and high frequency
• B. high wavelength and low frequency
• C. low wavelength
• D. All of the above

Answer 1

The Correct Option is B

In the context of visible light, red color is known for having a high wavelength and a low frequency. This relationship between wavelength and frequency is derived from the equation that defines the speed of light:

c = λν

where:

• c is the speed of light in a vacuum, approximately 3.00 x 10⁸ meters per second.
• λ (lambda) represents the wavelength.
• ν (nu) represents the frequency.

According to this equation, wavelength and frequency are inversely proportional. This means as the wavelength increases, the frequency decreases. Red light is on the longer wavelength end of the visible spectrum (approximately 620-750 nm), which results in a lower frequency compared to colors with shorter wavelengths such as blue or violet.

Thus, in visible light, the red color possesses:

• High Wavelength (Longer in comparison to other colors)
• Low Frequency (Lower than colors with shorter wavelengths)

The correct choice that reflects this is: high wavelength and low frequency.

Answer 2

Explanation: 

In the visible light spectrum, red light has:

• Highest wavelength (around 620–750 nm)
• Lowest frequency among all visible colors

This is because the speed of light (c) is constant in a medium, and it's related to frequency (f) and wavelength (λ) by:

$$ c = \lambda f $$

So, if wavelength increases, frequency must decrease.

Correct Answer: high wavelength and low frequency