Shock Waves: a Jet Aircraft, in Level Flight at Constant

question 72

Multiple Choice

Shock waves: A jet aircraft, in level flight at constant speed, is observed directly overhead. A sonic boom is heard later, at which time the line of sight to the aircraft forms a 56° angle with respect to the horizontal. The speed of sound is 325 m/s. What is the Mach number (the ratio of the speed of the jet to the speed of sound) for the aircraft?

• A) 1.2
• B) 1.8
• C) 1.9
• D) 2.1
• E) 2.2

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