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AQA A-level Physics Waves Required Practical 1 Mark Scheme
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Mark scheme for the corresponding document: 'AQA A-level Physics Waves Required Practical 1'.
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1 Defining the problem
A is the independent variable and f is the dependent variable or vary A and measure f 1
keep M constant 1
Methods of data collection
labelled diagram of workable experiment including: 1
• elastic cord fixed at one end to a support
• other end passed over a pulley
• labelled pulley
• labelled load
vibrator connected to signal generator 1
increase/decrease the frequency of the signal generator until stationary wave pattern is observed 1
measure diameter of cord with micrometer/calipers 1
Method of analysis
plot a graph of f 2 against 1 / A or equivalent (e.g. lg f against lg A) 1
relationship valid if a straight line passing through the origin is produced 1
(for lg f against lg A, relationship valid if a straight line with gradient –½)
M 1
k=
gradient × 4 × L2
(for lg f against lg A, k = M / [10(2 × y-intercept) × 4 × L2] )
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Question Answer Marks
1 Additional detail including safety considerations 6
D1 use safety goggles/safety screen to prevent injury to eyes from (moving) elastic cord/load
or
use cushion/sand box in case load falls
D2 keep L constant
D3 use cords of the same material/density
D4 use CRO to determine f (or T)
D5 method to determine T from CRO, e.g. period = time base × length of one wave
D6 f = 1/T
D7 repeat measurement of diameter along cord and average
πd 2
D8 use of A =
4
D9 measure mass of the load on top-pan balance
D10 detail on determining frequency at the maximum amplitude, e.g. increase frequency until the amplitude starts to
decrease, then decrease frequency
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