Physics · Oct / Nov 2021 · Paper 42 · Question 6
0625
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Fig. 6.1 shows particles of a material in which a sound wave is travelling. Fig. 6.1 (not to scale)
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6(a)(i)[1]
C in line with smallest gap between dots
6(a)(ii)[1]
R in line with largest gap between dots
6(a)(iii)[1]
arrow corresponds to wavelength
6(b)[1]
1500 m / s
6(c)[3]
v = fλ in any form OR (f =) v / λ
(f =) 1500 / 0.12
(f =) 13 kHz OR 13 000 Hz
6(d)[2]
statement consistent with candidate’s answer to 6c
ultrasound is above 20 000 Hz
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