>
· You're looking at smoke particles in air under a microscope
· They appear to be jiggling about
· Why?
· (Don't worry if you can't work this out straight away - Albert Einstein was the bloke who eventually explained what's happening here!) 5.11 28 October 2011 11:10
· 5.11 understand the significance of Brownian motion
> Model 1
· What does the red puck represent?
· What do the metal balls represent?
[cid:image001.png@01CC9989.A14EFF60]
[cid:image002.png@01CC9989.A14EFF60]
> Model 3
· What do the "smoke" particles look like?
· Why are they moving?
· What do the "air" particles look like? 5.11 explained 28 October 2011 11:10 Model 1
· What does the red puck represent?
o The large, visible smoke particle
· What do the metal balls represent?
o The small, not visible air particles Model 2
· What do the small red particles represent?
o The small, not visible air particles
· What does the large blue particle represent?
o The large, visible smoke particle
· What does the view on the left of the screen represent?
o The view through the microscope lense
· Why can‘t you see the red particles in this view?
o They are too small to see Model 3
· What do the "smoke" particles look like?
o They are the 5 large, sand coloured particles
· Why are they moving?
o Small, fast moving air particles are colliding with the smoke particles and making them move
· What do the "air" particles look like?
o They are the numerous, small, white particles 5.11 Questions 02 November 2011 17:21
1. Draw the path of a smoke particle in air (3 marks) Away from the air ----> they are pushed in whatever the direction the air particles move 2. Explain what is meant by Brownian Motion of smoke particles in air and how it provides evidence for air particles (4 marks)
Brownian motion of smoke particles is the random movement of particles, and this provides eidenc as The smoke particle has a jerky motion.
As (invisible) air molecules collide with the smoke particle,
they push it about in different directions at random.
3. What change would you expect to see in the movement of the smoke particles if the air was cooled down? Why? (2 marks)
the movement would slow down as the air particles had less kinetic energy. 
· You're looking at smoke particles in air under a microscope
· They appear to be jiggling about
· Why?
· (Don't worry if you can't work this out straight away - Albert Einstein was the bloke who eventually explained what's happening here!) 5.11 28 October 2011 11:10
· 5.11 understand the significance of Brownian motion
> Model 1
· What does the red puck represent?
· What do the metal balls represent?
[cid:image001.png@01CC9989.A14EFF60]
[cid:image002.png@01CC9989.A14EFF60]
> Model 3
· What do the "smoke" particles look like?
· Why are they moving?
· What do the "air" particles look like? 5.11 explained 28 October 2011 11:10 Model 1
· What does the red puck represent?
o The large, visible smoke particle
· What do the metal balls represent?
o The small, not visible air particles Model 2
· What do the small red particles represent?
o The small, not visible air particles
· What does the large blue particle represent?
o The large, visible smoke particle
· What does the view on the left of the screen represent?
o The view through the microscope lense
· Why can‘t you see the red particles in this view?
o They are too small to see Model 3
· What do the "smoke" particles look like?
o They are the 5 large, sand coloured particles
· Why are they moving?
o Small, fast moving air particles are colliding with the smoke particles and making them move
· What do the "air" particles look like?
o They are the numerous, small, white particles 5.11 Questions 02 November 2011 17:21
1. Draw the path of a smoke particle in air (3 marks) Away from the air ----> they are pushed in whatever the direction the air particles move 2. Explain what is meant by Brownian Motion of smoke particles in air and how it provides evidence for air particles (4 marks)
Brownian motion of smoke particles is the random movement of particles, and this provides eidenc as The smoke particle has a jerky motion.
As (invisible) air molecules collide with the smoke particle,
they push it about in different directions at random.
3. What change would you expect to see in the movement of the smoke particles if the air was cooled down? Why? (2 marks)
the movement would slow down as the air particles had less kinetic energy.
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