Light waves carry energy. Two properties of light include reflection and refraction. When light bounces off an object, it is called the reflection of light. When light passes from one transparent medium to another, its speed changes and it bends. This is called refraction of light. Light travels faster than sound.
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The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.