Wavelength of light is
**Core Concept**
The wavelength of light is a fundamental physical parameter that describes the distance between consecutive peaks or troughs of a light wave. It is a critical concept in optics and is essential for understanding various phenomena, including refraction, diffraction, and interference.
**Why the Correct Answer is Right**
The wavelength of light is a measurable property that can be determined using various methods, including spectroscopy. In physics, the wavelength of light is typically measured in units of meters (m) and is related to the frequency of the light wave through the speed of light (approximately 3 x 10^8 m/s). The correct answer is based on the fundamental relationship between the speed of light, its frequency, and its wavelength, as described by the equation: c = λν, where c is the speed of light, λ (lambda) is the wavelength, and ν (nu) is the frequency.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not provide a specific value for the wavelength of light.
* **Option B:** This option is incorrect because the wavelength of light is not directly related to the speed of sound.
* **Option C:** This option is incorrect because it is a value for the speed of light, not its wavelength.
**Clinical Pearl / High-Yield Fact**
In optics, the wavelength of light is a critical parameter that affects the behavior of light as it interacts with matter. Understanding the wavelength of light is essential for designing optical instruments, such as microscopes and telescopes, and for applications in fields like medicine, materials science, and telecommunications.
**Correct Answer: C. 656 nanometers**