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frequency = velocity/wavelength

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n = vA/vG

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This highly possible to come out as the question my guess for drawing focal things

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longitudinal: oscillations/vibration of particles/molecules in direction of travel

(of wave) B1

transverse: oscillation /vibrations of particles/molecules perpendicular to

direction of travel (of wave) B1

(ii) 1. e.g. sound wave / compression wave on a spring B1

2. e.g. any named electromagnetic wave / ripples / water wave / wave on a

stretched rope

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