Question
Sound travels fastest in which
medium? ÂSolution
Sound needs a medium to travel; it travels fastest in solids, especially metals like iron.  In solids, particles are tightly packed, allowing faster vibrations.  In gases, particles are far apart, so sound is slowest.  Sound cannot travel in vacuum.
12 7 10 25 107 ?
...30, 39, 66, ? , 174, 255
 47                         54          ?             74          87          ...
65    69   77 93  ?    189
18 113 559 2247 6721 13451
...219 365 511 ? 803 949
...10Â Â Â Â Â Â Â Â 6Â Â Â Â Â Â Â Â Â Â Â Â Â Â 5Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 8.5Â Â Â Â Â Â Â Â Â Â 16Â Â Â Â Â Â Â Â Â Â Â Â Â ?
...22   39    58    81   ?      141
Complete the series.
19, 23, 26, 30, 33, ?
1240 600 ? 140 90 25
...
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