So It's Back To First Principles (Part 2)

The sonic boom then propagates as a normal sound wave perpendicular to the “frozen” Mach cone.

However, @kincses-zsolt believes that the angle is not 90°, but becomes smaller as it approaches the tip of the cone.

@howdoiknowthisinfo together with other members here in the forum over one year ago

Yes, this building, but through a hole of the front wall