Physics (AS & A Level) · May / June 2016 · Paper 22 · Question 4
9702
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4(a)[2]
longitudinal: vibrations/oscillations (of the particles/wave) are parallel to the direction or in the same direction (of the propagation of energy) transverse: vibrations/oscillations (of the particles/wave) are perpendicular to the direction (of the propagation of energy) [2]
4(b)[3]
LHS: intensity = power / area units: kg m s–2 × m × s–1 × m–2 or kg m2 s–3 × m–2 RHS: units: m s–1 × kg m–3 × s–2 × m2 LHS and RHS both kg s–3 [3]
4(c)(i)[1]
change/difference in the observed/apparent frequency when the source is moving (relative to the observer) [1]
4(c)(ii)[1]
wavelength increases/frequency decreases/red shift [1]
4(d)[3]
observed frequency = vfS / (v – vS) 550 = (340 × 510) / (340 – vS) vS = 25 (24.7) m s–1 [3]
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