Speed of – McqOptions

MCQOPTIONS

1.	Speed of
A.	sound at 0¬∞C is 1190 km p.h.
B.	sound varies 2.4 km p.h. per degree centrigrade rise in temperature
C.	sound at 0¬∞C is called one Mach
D.	an aircraft flying at 2975 km p.h., is called 2.5 Mach
Answer» E.

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