The Mach Half-Angle for a Jet Traveling at Exactly Mach $V _ { \text {jet } } = 2 v$

Multiple Choice

The Mach half-angle for a jet traveling at exactly Mach 2 ( $V _ { \text {jet } } = 2 v$ ) is

A) 90º.
B) 0º.
C) 45º.
D) 30º.