CHAPTER 11. 2D AND3D WAVEFRONTS 11.6
For the Concorde this means that
sin θ =
340
647
θ = sin−^1
340
647
θ = 31. 7 o
Aircraft speed at altitude speed at altitude Mach Cone Angle
(km· h−^1 ) (m· s−^1 ) (degrees)
Concorde 2 330 647 31.7
Gripen 2 410 669
Mirage F1 2 573 715
Mig 27 1 885 524
F 15 2 660 739
F 16 2 414 671
Now calculate the MachCone Angles for the other aircraft in the table.
More practice video solutions or help at http://www.everythingscience.co.za
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Chapter 11 — Summary
See the summary presentation ( Presentation: VPqyv at http://www.everythingscience.co.za)
- Huygen’s Principle states that every point ona wavefronts acts as a source of
waves radiating isotropically.
- Constructive interference occurs when two waves combine to form a larger dis-
turbance.
- Destructive interference occurs when two waves combine to form a smaller dis-
turbance.
- When a wave passes through a slit, diffraction of the wave occurs. Diffraction of
the wave is when the wavefront spreads out or ”bends” around corners.
- A sonic boom or shockwave is formed whenan object moves fasterthan the
speed of sound in a medium due to constructiveinterference.
