Answers to questions in the Student Book - Hodder Plus Home

GCSE Physics for CCEA second editionIn-text questionsChapter 5 Waves, sound and light1. a) Energy flows from A towards B.b) In a longitudinal wave, X vibrates parallel to the axis of the slinky.c) In a transverse wave, X vibrates perpendicular to the axis of the slinky.d) Another example of a transverse wave is a water wave.2. a) = 60 ÷ 4 = 15 cmb) number of waves pass the marker in 1 second = 10 ÷ 4 = 2.5c) 2.5 Hzd) v = f = 2.5 Hz x 15 cm = 37.5 cm/s3. a) A lightning flash is generally seen before thunder is heard because light travels faster in airthan sound.b) distance = speed x time = 330 m/s x 4 s = 1320 m4. total distance travelled by sound = speed x total time = 330 m/s x 6 s = 1980 mdistance to cliff = ½ x total distance = ½ x 1980 = 990 m5. a)Frequency (Hz) 680 440 170 136 85 68Wavelength (m) 0.5 1.0 2.0 2.5 4.0 5.01/Wavelength (m -1 )2.0 1.0 0.50 0.40 0.25 0.20b) Graph: line of best fit is a straight line through the origin.c) Incorrect point is (1.0, 440)d) directly proportionale) The value of f for all table values (except the second) is 340 m/s.6. a) wavelength = 14 cm ÷ 6 = 2.33 cmb) distance between ripple A and ripple F = 2.33 x 5 = 11.65 cmspeed of waves distancetime11.65 = 1.165 cm/s10frequency speedwavelength1.165 = 0.5 Hz2.3323