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Q.

Is it true that the dust particles can be seen moving in a beam of sunlight in a dark room?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
Air contains dust particles. We can see the path of a beam of sunshine as it enters a dusty room through a window. The tiny dust particles in the room's air scatter the light beam all over the place. This scattering of the beam of light by a medium containing small suspended dust particles is known as the Tyndall effect. So, when you enter a dark room, dust particles can be seen moving in a beam of sunlight.
 
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