Ans Higher Level Paper Exam Answers

** OLD e-mail

Ans Higher Level Paper Exam Answers

28 April 2011

08:06

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P3 Higher Level Paper Revision Questions (on L+L).docx Download this file

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Objectives for Trial Exam

Dear Y11 Physicists,

Quite a few of you have e-mailed me asking for the P5 Objectives sheet and also which
objectives from P5 will be covered in the Trial Exams. I’ve attached the word doc and
highlighted the objectives for the trial exam in the e-mail below.

If you remember we missed some of the objectives from P1 when we did this unit (all
the way back at the beginning of Y10!) – naturally these won’t be on the trial exam
either. I’ve highlighted the objective from P1 you will be assessed on below.

Best wishes,

Mr B

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IGCSE Physics Student Objectives for Unit 5 - New Specification.doc Download this file

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Answers

** Mr.Baker, I tried to edit the post directly on posterous, but for some reason, the post would not display the answers (it displayed only half the post for me to edit); my answers were correct though, so no need for any corrections anyway.

Here are the answers to the questions as promised. Now correct the work that you blogged. Two options to do this:

1. Send another e-mail to your blog called “Corrections to…” and highlight the changes in a different colour.

2. Edit your blog post and make the changes in a different colour.

Cheers,

Mr B

5.12+5.15 Answers

02 November 2011

15:55
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http://www.lon-capa.org/~mmp/kap10/cd283.htm

Answers
1. The particles create a pressure by colliding with the walls of the container CORRECT
2. If you increase the temperature the average speed of the particles increases CORRECT
3. If you increase the temperature the number of collisions per second increases CORRECT
4. If you increase the temperature the pressure increases CORRECT

5.11 Answers

02 November 2011

17:32

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Brownian Motion Answers.ppt Download this file

5.11

Instructions for Objective 5.11

1. 5.11 Starter. Watch the video and think about the question. No need to type anything.

2. 5.11. Watch the videos and animations for the 3 models of Brownian Motion (for Model 3 you need to open the attached). Think about the questions. No need to type anything.

3. 5.11 explained. Check your understanding with the model answers.

4. 5.11 Questions. Forward this e-mail to your blog and complete the questions.

5. Answers to step 2 will be sent separately. Don’t look at them until you’ve done the work!

5.11 Starter

02 November 2011

16:58

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· 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

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Model 1
· What does the red puck represent?
· What do the metal balls represent?
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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)
-> Random path (or 'random walk') similar to:

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 explains the phenomenon of visible smoke particles apparently 'jiggling' about, and traveling in random directions. These smoke particles are pushed in these random directions by the random collisions with small, fast moving air particles; this provides evidence for air particles as without the air particles, the smoke particles would not be 'jiggling about' but rather traveling in a more smooth manner.
3. What change would you expect to see in the movement of the smoke particles if the air was cooled down? Why? (2 marks)
-> I would expect the smoke particles to move less erratically, as the air particles would have less kinetic energy, meaning that there would be less collisions with the smoke particles to move them about (collision theory). The smoke particles would therefore still be moving, simply not as much.

brownian_motion.swf Download this file

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Next Physics e-lesson 5.12+5.15

This e-lesson consists of 3 objectives; 5.12, 5.15 and 5.11. I’ll e-mail the other objective separately.

Instructions for Objective 5.12 and 5.15

1. 5.12+5.15 Starter. Watch the video and think about the question. No need to type anything.

2. 5.12+5.15 Questions. Open the animation. Forward this e-mail to your blog and complete the questions.

3. 5.12+5.15 Plenary. Open the attached ppt. View as slide show. Think about what the blanks in the table are. Check your answers with slide 2. No need to type anything.

4. Answers to step 2 will be sent separately. Don’t look at them until you’ve done the work!

5.12+5.15 Starter

02 November 2011

16:15

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Questions
· Why does the needle on the meter move when gas particles are introduced into the box?
· What does the meter measure?

Answers
· The gas particles collide with all of the walls of the container. The wall on the right moves outwards and moves the needle.
· Pressure. The gas particles colliding with the walls makes a force on the walls. The walls have a surface area so the quantity measured is pressure, p=F/A.

5.12+5.15 Questions

02 November 2011

15:55
· 5.12 recall that molecules in a gas have a random motion and that they exert a force and hence a pressure on the walls of the container
· 5.15 understand that an increase in temperature results in an increase in the speed of gas molecules
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Try the animation http://www.lon-capa.org/~mmp/kap10/cd283.htm
1. How do the particles create a pressure?
-> The particles 'bump' into the wall, and as they have the kinetic energy, this energy is exerted on the wall when the particles collide with the wall - this energy is known as 'pressure'
2. If you increase the temperature, how does the movement of the particles change?
-> By increasing the temperature, you increase the average kinetic energy of the fluid, therefore the particles have more energy and they move around faster.
3. If you increase the temperature, how does the number of collisions per second change?
-> The number of collisions/second would increase, as they move faster, so they have a higher chance of colliding with both each other, and the wall (collision theory)
4. If you increase the temperature, what does this do to the pressure?
-> By increasing the temperature, you increase the amount of collisions per second (particles with the wall), meaning that in a given period of time, more force is exerted on the same amount of surface area and from the equation: p = F/A, this means that the pressure would thereby also increase.
5.12+5.15 Plenary

02 November 2011

15:55

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Ideal gases - summary of terms.pptx Download this file