Physics · Oct / Nov 2020 · Paper 42 · Question 6
0625
As printed in the paper
The question as text
Fig. 6.1 shows a transverse wave produced in a string. string Fig. 6.1 (full size)
Read automatically from the paper; the printed page above is exact.
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6(a)(i)[2]
1
amplitude marked correctly
2
wavelength marked correctly
6(a)(ii)[1]
trough labelled T
6(b)[3]
f = 15 / 60 (= 0.25)
v = f λ in any form OR (v =) fλ words, symbols or numbers
(v =) 0.08 × 0.25 (= 0.02 m / s) OR 0.25 × 8 (= 2.0 cm / s)
Alternative route 1 :
v = d ÷ t words, symbols or numbers
distance moved in one minute = 15 × 8 OR 120 OR 15 × 0.08 OR 1.2
(v =) 120 / 60 (= 0.02 m / s) OR 120 ÷ 60 OR 15 × 0.08 ÷ 60 OR 1.2 ÷ 60
Alternative route 2 :
time for 1 oscillation = 4 s
distance moved in 4 s = 8 cm
so speed = 8 ÷ 4 = 2 cm / s
6(c)[2]
oscillation at right angles to the direction of propagation / travel / energy transfer (of the wave)
oscillation parallel to / in the direction of propagation / travel / energy transfer (of the wave) OR has compressions and rarefactions OR needs / must have a medium
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