# 11-Waves-1-Mark-Scheme.pdf - 11 Waves 1 Exam-style mark...

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11 Waves 1Exam-style mark schemeOCR Physics AQuestionAnswerMarksGuidance1 aThe radiant power passing through a surface per unitarea.B11 b iAandBshould be one wavelength apartB1Peak to peak, trough totrough, or any correct answer1 b iiThe number of waves passing a set point in 1 secondhertz/HzB1B11 b iiiWave 1:Wavelength=0.8mAmplitude=10cmWave 2:Wavelength=1.4mAmplitude=5cmB1B1B1B1No alternative answersallowed1 c iLongitudinal:Oscillation parallel to direction of energy transferTransverse:Oscillation at 90° (or perpendicular) to direction ofenergy transfer(Sound waves are) longitudinalB1B1B11 c iiT=5 squaress1.0102053=××=T1.011==Tf10HzM1M1A1Unit required for mark.2 a i(At least) one normal drawnRefraction at both glass–air boundariesCorrect angle of reflectionB1B1B1Must be at point where a raymeets a boundary.Needed when ray entersandleaves the glass.

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Snell s Law