Question

Question #5dc30

Answer 1

1. The colour of light is determined by its wavelength . For an example Blue light has a shorter wavelength than red light.

2. All wavelengths of the light travel at the same speed in a vacuum.

Explanation:

1. A wavelength is one cycle of a wave, and we measure it as the distance between any two consecutive peaks of a wave. We measure wavelengths in metres. All wavelengths are measured in metres. For an example Gamma rays can have wavelengths as short as 0.01 nm and Radio waves can have wavelengths of 1 mm to hundred or even thousands of kilometres.

Now that we have clarified the concept of wavelengths we can talk about how the colour of Visible light depends on its wavelength. Visible light corresponds to a wavelength range of 400 - 700 nanometers (nm) and a color range of violet through red. The shorter the wavelength the more blue it appears. The longer the wavelength the more red it appears.

1. All "colours" of light travel at the same speed in a vacuum. They travel at the speed of light (300 000 000 m/s). The colour of light does not matter when travelling in a vacuum. However when you are considering other mediums such as a prism the wavelength of the light does affect the speed. Red light refracted the least as it has the longest wavelength and Violet light is refracted the most as it has the shortest wavelength.