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Longitudinalwavescannottravel through vacuum because such wave requires a medium such as solid liquid or air to travel through. They cannot travel through vacuum or inspace.Longitudinal waves,also knownas "l- waves", are waves that have the same direction of vibration as their direction of travel, which meansthatthemovementofthemediumisinthe same direction as, or the opposite direction to, the motion of the wave.
31 40 51 64 79 ?
16, 9, ?, 114.25, 750.625, 6396.3125
17 18 14 ? 7 32
...What will come in place of the question mark (?) in the following series?
3.5, 9.5, 27.5, 81.5, 243.5, 729.5, ?
3 2 3 6 14 ? 115.5
7, 7, 21, 105, 735, ?
55, 71, 119, 199, 311, ?
124, 180, 108, 198, ?, 220
5 6 15 40 89 170 ?
...150, 158, 131, 195, 70, ?
