84) If two identical waves which are in-phase are placed exactly over on to each other and interfere with each other, wh

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84 If Two Identical Waves Which Are In Phase Are Placed Exactly Over On To Each Other And Interfere With Each Other Wh 1 (46.61 KiB) Viewed 11 times

84 If Two Identical Waves Which Are In Phase Are Placed Exactly Over On To Each Other And Interfere With Each Other Wh 2 (60.66 KiB) Viewed 11 times

84) If two identical waves which are in-phase are placed exactly over on to each other and interfere with each other, which of the following about the resultant wave is true: a) amplitude: doubled Period: doubled Wavelength: doubled b) amplitude: zero Period: unchanged Wavelength: unchanged c) amplitude: unchanged Period: unchanged Wavelength: unchanged d) amplitude: doubled Period: unchanged Wavelength: unchanged e) none of the above 85) The Mach number of an airplane travelling at 2.0 x 103 km/h through 8°C air is a) 6 b) 2 c)3 d) 7 e) none of the above

Part B: True or False - Bubble the correct answer on your scantron - "a" = true, "b" = false (online students, please complete the google form) [K - 10 marks] 86. Ultrasonic waves have frequencies above the human audible range 87. Interference between two waves leaves one or both waves permanently altered after they pass through each other 88. The average human hearing range is between 20 Hz and 2000 Hz 89. The human outer ear consists of the pinna only 90. The Human Ear can be viewed as the detector of sound - it captures the energy of sound waves 91. Sound waves are transverse waves 92. According to your textbook, there is no cure for deafness in humans when the signals from the cochlea are unable to travel through the auditory nerve. 93. According to your textbook, in the human ear, the cochlea and auditory nerve are part of the middle ear 94. According to your textbook, elephants produce ultrasonic waves, which travel partially through the ground. The can detect these sounds with their feet and trunks pressed against the ground. 95. According to your textbook, cats use their large movable pinnae to amplify sound and to detect the direction which sounds are coming