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DOPPLER EFFECT AND SUPERSONIC TRAVEL

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by

Mehar Bhardwaj

on 8 January 2014

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Transcript of DOPPLER EFFECT AND SUPERSONIC TRAVEL

design by Dóri Sirály for Prezi
"The Sound Barrier"
-Point at which aircraft surpasses the speed of sound
-Increased drag (surpasses Transonic, and reaches a Supersonic speed )
-Reduced controllability
-it was seen as an obstacle which had to be surpassed to achieve supersonic speeds.

Step 2
Step 3
Goal
DOPPLER EFFECT
AND
SUPERSONIC TRAVEL
By: Ananya, Simran, Mehar & Harkrishan
What is the Doppler Effect?
- increase or decrease in the frequency of sound, light, or other waves as the source & the observer move towards or further away from each other
LIGHT
- the case now regards colour (the wavelength that is shifted by the motion of the source)
- wavelengths are greater when the source is moving away from the observer, and smaller when the source is moving towards the observer
when celestial bodies move away from the observer, red shift occures
when celestial bodies move towards the observer, blue shift occures
RED SHIFT
BLUE SHIFT
since this part of the galaxy is moving away from the observer, it will be
red shifted
!
PLANET
since this part of the galaxy is moving toward the observer, it will be
blue shifted
!
The Doppler effect is not produced by all moving sources of sound!
speed of
sound
: 332m/s
average speed of a
siren on an emergency vehicle
: 30m/s

speed of the vehicle is 10% of the speed of sound, making it a reasonable fraction.

*
velocity of the moving source of sound must move parallel to the observer to produce the doppler effect
*
*
THE SPEED OF THE SOURCE OF SOUND MUST BE LESS THAN THE SPEED OF SOUND
*
SOUND MOVING IN AN ORBIT AROUND THE OBSERVER WILL NOT CREATE THE DOPPLER EFFECT!


~~CALCULATING THE DOPPLER EFFECT~~


f =
obs
frequency we observe (original)
f =
source
frequency of source (apparent)
f
=
obs
( )
___________
V
V
V
V
sound
source
sound
detector
+
+
f

source
*If source is moving
toward
the detector/observer, the speed of sound is
negative
*
*If source is moving
away
from the detector/observer, the speed of sound is
positive
*
speeds of the source and detector are constant

signs (+, -) instantly switch once the source passes the detector
now.... the source of sound isn't always slower than the speed of sound.


MACH NUMBER
Ernst Mach
1893-1916
researched sound waves!
what is it?
Mach Number
: ratio between local speed of sound and airspeed
CALCULATING THE MACH NUMBER
FORMULA:
M =
airspeed of object
_________________________
local speed of sound
*REMEMBER THERE ARE NO UNITS USED FOR THIS VALUE*
DETERMINING IF THE SPEED IS "SUBSONIC" OR "SUPERSONIC
SUBSONIC
: speed less than that of sound

< Mach 1.0
SUPERSONIC
: speed greater than that of sound

> Mach 1.0
example: a car traveling at 30m/s
example: SR-71 Blackbird
TRY THE EXAMPLE ON THE HANDOUT!
SUPERSONIC TRAVEL
what is it?
THE END :D
SUPERSONIC TRAVEL :
when the speed of an object is greater than "Mach1" (the speed of sound)
When this happens,
the sound barrier is broken
What is the sound barrier?
Full transcript