Physics
When a strong beam of light is passed through a colloidal solution, the light will

Be absorbed
Be reflected
Pass unchanged
Be scattered

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is less than that between concrete and feet.
sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.
the sand is grainy but concrete is smooth.

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