Solving for Vv= The doppler Effect

In summary, the conversation is about solving for Vw using the formula for the Doppler effect. The speaker is having trouble with their calculations and asks for help. Another person points out a mistake in the second step and suggests simplifying the equation to solve for Vw.
  • #1
XxphysicsxX
22
0
The problem:
I have to answer a question about the Doppler effect using the formula attached.
I know i have to solve for Vw, but I get
Vw/Vw=(Fd/Fs)(-Fs)

and I am possitive that's not right, can someone please help me out??
Thankyou
 

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  • #2
Transfer the denominator in the right hand side to the left hand side. Simplify and collect the terms containing fw.
 
  • #3
i get:

Fd (Vw- Vs) = VwFs
Fd( Vw-Vs) - Vw= Fs

but the two Vw just cancel each other out again..
I don't know what I am doing wrong...
 
  • #4
XxphysicsxX said:
i get:

Fd (Vw- Vs) = VwFs
Fd( Vw-Vs) - Vw= Fs
but the two Vw just cancel each other out again..
I don't know what I am doing wrong...

The second step is wrong.

Fd(Vw - Vs) = VwFs

FdVw - FdVs = VwFs
In the multiplication you cannot transfer a single term to the other side.
Now collect the terms containing vw on one side and find its expression.
 
  • #5
XxphysicsxX said:
The problem:
I have to answer a question about the Doppler effect using the formula attached.
I know i have to solve for Vw, but I get
Vw/Vw=(Fd/Fs)(-Fs)

and I am positive that's not right, can someone please help me out??
Thankyou

Given Fd = [Vw/(Vw-Vs)]Fs then
(Vw-Vs)/Vw = Fs/Fd

Simplify the lefthand term to get Vw by itself and continue.
 

FAQ: Solving for Vv= The doppler Effect

1. What is the Doppler Effect?

The Doppler Effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. It is commonly experienced with sound waves, such as the change in pitch of a siren as an ambulance drives by.

2. How does the Doppler Effect affect light waves?

The Doppler Effect also applies to light waves, but it is more commonly observed with sound waves due to the large differences in speed between sound and light. The Doppler Effect causes a shift in the wavelength and frequency of light, known as redshift or blueshift, depending on whether the observer is moving towards or away from the light source.

3. How is the Doppler Effect used in astronomy?

In astronomy, the Doppler Effect is used to measure the movement of celestial bodies, such as stars and galaxies. By analyzing the redshift or blueshift of light emitted from these objects, scientists can determine their speed and direction of movement.

4. Can the Doppler Effect be used to measure the speed of objects in space?

Yes, the Doppler Effect is commonly used to measure the speed of objects in space. By analyzing the shift in the wavelength of light emitted from these objects, scientists can calculate their speed and direction of movement.

5. Are there any other applications of the Doppler Effect?

Yes, the Doppler Effect has many other applications, including in radar technology, sonar technology, and medical imaging. It is also used in the development of new technologies, such as Doppler weather radar and Doppler lidar, which are used to track and measure weather patterns.

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