When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
Brownian movement.
Dialysis
Diffusion
Osmosis
Tyndall effect
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The Tyndall effect, also known as Tyndall scattering, is the scattering of light by particles in a colloid, making a light beam visible as it passes through a medium containing suspended particles, like smoke or dust.
The Tyndall effect is the scattering of light by particles in a colloid or very fine suspension.
How it works:
When light passes through a medium containing small particles, these particles scatter the light in all directions, making the path of the light beam visible.
Examples:
Seeing the path of a flashlight beam in a room with dust or smoke.
The blue color of the sky (though this is primarily due to Rayleigh scattering, the Tyndall effect also plays a role).
The blue color of the smoke emitted by motorcycles, particularly two-stroke machines.
The visible path of a light beam in fog or mist.
Distinguishing colloids from solutions:
The Tyndall effect can be used to distinguish between a colloid and a true solution, as colloids scatter light while true solutions do not. The effect is named after the Irish physicist John Tyndall, who first studied it in detail.
when dust particles move randomly in air it is known as brownian motion
tyndall effect occurs when light passes through a collodial solution such as milk
The correct answer is A. Brownian movement.
This is a classic "trap" question because both the Tyndall effect and Brownian movement are visible when you look at a beam of sunlight in a dusty room. Here is how to distinguish them so you never miss this in an exam:
1. Why it is Brownian Movement
The question highlights the random collision and motion of the particles.
When you see dust "dancing" or "jiggling" erratically in a sunbeam, you are witnessing Brownian movement.
The dust particles are being bombarded by invisible air molecules, causing them to move in a zig-zag, random path.
2. Why it is NOT the Tyndall Effect
The Tyndall effect refers only to the visibility of the beam of light itself.
If the question asked why the "path of the light is visible," the answer would be the Tyndall effect.
The Tyndall effect is an optical phenomenon (scattering light), whereas Brownian movement is a mechanical/kinetic phenomenon (random motion).
3. Quick Review of the other options
B. Dialysis: A process used to separate colloidal particles from true ions using a semi-permeable membrane (often used in artificial kidneys).
C. Diffusion: The movement of particles from a region of high concentration to low concentration (like smelling perfume across a room).
D. Osmosis: The movement of water molecules through a semi-permeable membrane.
I am absolutely sure! In the context of the question you provided, Brownian movement is the specific term for that "random collision" or "dancing" motion of the dust particles.
It is one of the most common "gotcha" questions in the JAMB Chemistry and Physics syllabus because people see "Sunlight" and immediately jump to the Tyndall effect.
Here is the f**lproof way to tell them apart when you see them in the same scenario:
The Sunlight "Double-Feature"
When you look at a beam of light in a dusty room, you are actually seeing two different scientific phenomena happening at the exact same time:
The Tyndall Effect (The "Path"): This is why you can see the long, straight "beam" or "column" of light at all. Without the dust scattering the light toward your eyes, the beam would be invisible.
Focus: Light scattering.
Brownian Movement (The "Dance"): This is why the individual dust particles are jiggling, swirling, and colliding randomly instead of just falling straight to the floor. They are being hit by air molecules.
Focus: Random motion/collision.
Why the other options don't fit:
C. Diffusion: This is just the general spread of particles (like a smell spreading). It doesn't describe the "random collision" visible in a beam.
D. Osmosis: This requires a semi-permeable membrane and a liquid solvent (like water moving into a cell). It doesn't happen with dust in the air.
B. Dialysis: This is a lab technique for cleaning colloids; it has nothing to do with sunlight or dust.
The Verdict: Because your question explicitly used the words "collide randomly," the examiner is testing your knowledge of the kinetic (motion) property, which is Brownian movement.
i think the answer is A
Brownian movement is the random movement of particles in fluid so it can't be the answer
THIS 
APP NEEDS PLENTY OF CORRECTIONS
1ITS SO SLOW
2 NO EXPLANATIONS
3 SOME DONT EVEN HAVE QUESTIONS LIKE FMATHS
The correct answer is:
A. Brownian movement
Brownian movement refers to the random, erratic motion of particles suspended in a fluid (liquid or gas) due to constant collisions with molecules of the medium. The dust particles in the beam of sunlight move randomly because of this effect.
