This preview shows pages 1–3. Sign up to view the full content.
Exploration Guide: Doppler Shift Advanced
Calculating Doppler Shift
1.
a.
The observed frequency of the sound waves is 1333.3 Hz.
The Observed frequency is higher than the
Source frequency which is 1,000 Hz.
b.
The original frequency was multiplied by a factor of 1.333 to get the observed frequency.
c.
v
sound
v
source
v
sound
 v
source
Observed
Frequency
Factor
240
60
180
1333.3
1.333
240
80
160
1500.0
1.5
240
120
120
2000.0
2
240
160
80
3000.0
3
240
180
60
4000.0
4
e.
The relationship I see between the speed of sound between the first, third and fifth column is that the speed
of sound is constant. The difference between the speed of sound and the speed of the source is that it
decreases by 60 from the first column to the third column and from the third column to the fifth column.
The factor by which the original frequency is multiplied is related to the speed of sound and the speed of
the source. That is to say, the speed of sound divided by the difference between the speed of sound and the
speed of the source is equal to the factor.
f.
=

Fobs ss v F
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Documentg.
v
sound
= s = 500 m/s
v
source
= v = 120 m/s
[Solve]
=

Fobs ss v F
=
/
/ –
/
Fobs 500 m s500m s
120 m s 1000 Hz
=
.
Fobs 1315 79 Hz
Yes, the answer I obtained from the equation was correct.
2.
a.
The observed frequency of the sound waves is 800 Hz and this is lower that the Source frequency.
b.
This is the end of the preview. Sign up
to
access the rest of the document.
 Spring '10
 Dr.Fleisig
 Frequency

Click to edit the document details