| 41. | Sometimes Internet technology moves faster than the speed of sound.
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| 42. | :When a bubble collapses-it moves at the speed of sound.
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| 43. | At sea level, Mach 1 is the speed of sound.
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| 44. | Champagne on the Concorde, traveling at twice the speed of sound over the Atlantic.
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| 45. | How does it feel to drive the speed of sound?
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| 46. | Doppler radar return is generally not ambiguous until velocity exceeds the speed of sound.
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| 47. | It was pretty close to the speed of sound.
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| 48. | Modern jetliners typically cruise about four-fifths of the speed of sound, or Mach . 8.
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| 49. | Their fighter jets might soar through enemy air space faster than the speed of sound.
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| 50. | However, scramjets must be traveling at about five times the speed of sound to work.
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