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In the International Standard Atmosphere, temperature in the troposphere

  • A.Falls steadily with increasing altitude
  • B.Rises steadily with increasing altitude
  • C.Stays exactly constant with altitude
  • D.Falls and then rises repeatedly with altitude

Answer: A

The standard lapse rate is a fall of about 6.5 kelvin per kilometre up to the tropopause, above which the model holds temperature constant through the lower stratosphere. Since the speed of sound follows temperature, it falls with height as well.

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