physics examinations 2006
Download
Skip this Video
Download Presentation
PHYSICS EXAMINATIONS – 2006

Loading in 2 Seconds...

play fullscreen
1 / 25

PHYSICS EXAMINATIONS – 2006 - PowerPoint PPT Presentation


  • 65 Views
  • Uploaded on

PHYSICS EXAMINATIONS – 2006. Bruce Walsh. REMINDERS. Calculators Study design and textbooks Examiners report VASS system SSMS. JUNE EXAMINATION. STATISTICS. 6712 students Mean = 90 = 50\% Std dev = 38.7 = 21.5\% Number achieving 100\% = 0. GENERAL COMMENTS.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'PHYSICS EXAMINATIONS – 2006' - mills


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
reminders
REMINDERS
  • Calculators
  • Study design and textbooks
  • Examiners report
  • VASS system
  • SSMS
statistics
STATISTICS
  • 6712 students
  • Mean = 90 = 50%
  • Std dev = 38.7 = 21.5%
  • Number achieving 100% = 0
general comments
GENERAL COMMENTS
  • Reasonably challenging paper
  • Detailed studies
  • Attempt ONE detailed study only
  • Explanations address specific question. – Diagrams
  • Show working
slide7
Converting units
  • Calculations – powers of 10

- raising to power eg. R3

  • Care reading scale on axes
  • Multiple choice questions
  • Illegible writing
problem areas motion
PROBLEM AREASMOTION
  • Q3. Two stage – get acc from F=ma then use const acc formula. Many assumed a=9.8. Few used W=ΔEK
  • Q6. Net force. Many neglected gravity. Others added it instead of subtracting
  • Q7. Multiple steps. Net force const. Use F=ma for acc then const acc for dist. OR I=Δp for speed then const acc for dist. Many assumed acc was g
slide9
Q8. Two components then Pythagoras. Multiple steps
  • Q11. I=Δp or get acc then f=ma Easier to treat space station than shuttle (3rd law). Confusion over masses and speeds
  • Q12. Conservation of energy. Some fudging
slide10
Q14. Conservation of energy. Loss of Grav PE = Gain in Spring PE. Many used F=-kx assuming f=mg at bottom
electronics photonics
ELECTRONICS & PHOTONICS
  • Q1. DC biasing. Parts 2 and 3 poorly done
  • Q3. Signal voltage - clipping
  • Q4. Decoupling capacitor. Most knew what it did but not why
  • Q8. Modulation
relativity
RELATIVITY
  • Q7-9. Confusion over frames of reference.
materials structures
MATERIALS & STRUCTURES
  • Q3. Reading axis ε=2% not 2
  • Q4. Calculated wrong material or misread strain axis
  • Q6. Work = Area of graph x Volume Many forgot volume or had calculation difficulties
further electronics
FURTHER ELECTRONICS
  • Q7. Operation of regulator
statistics1
STATISTICS
  • 6589 students
  • Mean = 111 = 62%
  • Std dev = 41 = 23%
  • Number achieving 100% = 20
general comments1
GENERAL COMMENTS
  • Accessible paper
  • Detailed studies
  • Illegible writing
  • Explanations must address specific question
slide19
Explanations – one mark per point
  • Show working
  • Unit conversions, eg. cm2 to m2
  • Read questions carefully. Answer what is asked not what you expect to be asked.
problem areas electric power
PROBLEM AREASELECTRIC POWER

Q1. Sketching magnetic fields.

Q8. E.M. induction. Trouble calculating area (units) and getting correct time

Q14-15. Operation of transformer

Q16. Overall distribution system

light and matter
LIGHT and MATTER
  • Q1. Incoherent light from wide spectrum sources. Confused with discrete emission spectrum.
  • Q2. Wave and particle predictions for PE effect.
  • Q6. Meaning of standing waves for electrons in stable states in atoms.
slide22
Q11. Distinction between matter and electromagnetic radiation. Wrong Planck’s constant. Assumption that because momentum was the same, energy was also. Electron speed taken as 3x108.
synchrotron
SYNCHROTRON
  • Q2. Explain two advantages.
  • Q5. Relate greater wavelength to reduced energy.
photonics
PHOTONICS
  • Q5. Operation of graded index multimodal fibres
  • Q6-7. Snell’s law
  • Q10. Rayleigh scattering increases as wavelength decreases.
sound
SOUND
  • Q6. Sound from front and rear out of phase, box prevents interference.
  • Q9. Unable to explain resonance in terms of behaviour of sound waves.
ad