Question

An airplane is cruising at a speed of 800 km/h at an altitude where the air temperature is $0^{\circ }C.$ The flight Mach number at this speed is nearly

• A. 1.3
• B. 0.67
• C. 0.25
• D. 2.4

Answer 1

The correct option is B 0.67

$Aeroplane=800\times \frac{5}{18}=222.22m/\sec$

$matchNo.=\frac{222.22}{332}=0.67$