Compléter Light and DarkVersion en ligne About light and dark par Hlaing Myo Htet 1 Things that give light are called light . 2 would not be able to make food without the sun . 3 Light is a form of . 4 The sun is a big . 5 Light travels in lines . 6 When you move the light near , the shadow becomes . 7 Light is within a certain portion of the electromagnetic spectrum . The word usually refers to visible , which is the that is visible to the and is responsible for the . Visible light is usually defined as having in the range of 400 ? 700 nanometers ( nm ) , or 4 . 00 × 10 ? 7 to 7 . 00 × 10 ? 7 m , between the ( with longer wavelengths ) and the ( with shorter wavelengths ) . This wavelength means a range of roughly 430 ? 750 terahertz ( THz ) . The primary properties of visible light are intensity , propagation direction , frequency or wavelength spectrum , and , while its in a , 299 , 792 , 458 meters per second , is one of the fundamental constants of nature . Light is also used in various other fields like , , and . The main source of light on Earth is the .
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