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# old edexcel markscheme? watch

1. hi,

anyone got a MS for that phy 4 - june 2000 paper? teacher gave me the paper and the MAS is not on that school website most people now know - know where i can get a hold of a copy?

pk

2. 1. What is meant by “an equation is homogeneous with respect to its units”:
Each side/term has the same units 1
Equation x = ut + ½ at2:
ut - (m s–1) s = m
at2/2 (m s–2) s2 = m
all 3 terms reduce to m 3
[Allow dimensions]
Explanation:
Wrong numerical constant/wrong variables
Units same, numbers wrong/
Units same, magnitudes wrong 1
Example = 1 kg + 2 kg = 5 kg
[5]

2. A body oscillates with simple harmonic motion when the resultant
force F acting on it and its displacement x are related by the expression
F =  kx or F   x.
The acceleration of such a body is always directed towards the centre
of the oscillation or in the opposite direction to displacement/x =
0 /equilibrium/similar
The acceleration of the body is a maximum when its displacement is
maximum and its velocity is maximum when its displacement is zero. 4
Force constant:
= 14
N m–1 or kg s–2 2
[6]

3. Circumstances under which two progressive waves produce
a stationary wave:
Both transverse/longitudinal/same type
Waves have same frequency/wavelength
and travel/act in opposite directions/reflected back. Max 2 marks
Experiment using microwaves to produce stationary waves:

How it could be shown that a stationary wave had been produced:
or minimum readings or zero 3
[5]

4.

One of compression C and one rarefaction R marked as above.
Wavelength of wave = 11 - 11.6 cm (u.e.)
One of maximum displacement M marked as above [M, 5th, 6th, 7th ].
Amplitude of wave = 8 ( 1 mm) [consequent mark]
[4]

5. Explanation:
Photons/quanta
Photon releases / used electron
Energy/frequency of red < energy/frequency of ultra violet
Red insufficient energy to release electrons so foil stays 4
Ultraviolet of greater intensity: foil/leaf collapses quicker/faster
Red light of greater intensity: no change/nothing 2
Observations if zinc plate and electroscope were positively charged:
Foil rises or Foil stays same/nothing
as electrons released it becomes more Released electrons attracted back by
positive positive plate/more difficult to
release electrons 2
[8]

6. Energy level diagram:

 13.6  0
 1.51  0 AND  3.39  0 ONLY 2
Why level labelled  13.6 eV is called ground state:
Correct reference to stability/lowest energy state/level of
the electron/ atom/hydrogen 1
Transition which would result in emission of light of wavelength 660 nm:
Correct use of c =f or E = hc/ or f =
Correct use of eV/J i.e. ÷ 1.6 × 10–19
E = 1.88
Transition = 1.5  3.39
[May be a downward arrow on diagram] 4
[7]

7. Maximum acceleration of mass:
a = () 2x with x = 6.0 mm used or a = ()(2f)2 x
 = or f =
= 23 mm s–2 [u.e.] 3
Graph:

Straight line
Line stops at 6, 0.023 [e.c.f. x, a] 4
Reason why mass may not oscillated with simple harmonic motion:
F not proportional to x or a not proportional to x
Spring past elastic limit: K not constant: spring may swing as well as bounce.
Other possibilities, but not air resistance, energy losses 2
[9]

I think this is the one. Hope its ok, spome of its gone a bit wrong cos its shortcuts 4 stuff but u'll get the jist of it
x
3. (Original post by Phil23)
hi,

anyone got a MS for that phy 4 - june 2000 paper? teacher gave me the paper and the MAS is not on that school website most people now know - know where i can get a hold of a copy?

pk

actually its the phy 5 one i'm after i think - the dumb teacher gave me the paper for phy 5 and cover sheet for phy 4 by the looks of it - bozo

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