PHYSICS EXAMINATIONS – 2006

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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.

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### 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
• Reasonably challenging paper
• Detailed studies
• Attempt ONE detailed study only
• Explanations address specific question. – Diagrams
• Show working
Converting units
• Calculations – powers of 10

- raising to power eg. R3

• Care reading scale on axes
• Multiple choice questions
• Illegible writing
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
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
Q14. Conservation of energy. Loss of Grav PE = Gain in Spring PE. Many used F=-kx assuming f=mg at bottom
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
• Q7-9. Confusion over frames of reference.
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
• Q7. Operation of regulator

### NOVEMBER EXAMINATION

STATISTICS
• 6589 students
• Mean = 111 = 62%
• Std dev = 41 = 23%
• Number achieving 100% = 20
• Accessible paper
• Detailed studies
• Illegible writing
• Explanations must address specific question
Explanations – one mark per point
• Show working
• Unit conversions, eg. cm2 to m2
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
• 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.
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