# Confusion in Doppler shift equation?

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1. Jan 3, 2016

### Tim541541

I'm just trying to build Doppler shift equation for Moving observer and stationary source. I have an problem in a step. I'm attaching a screen-shot please check it and tell me where to this step ( 1 - v/u)^-1 comes from ?

Thanks in advance.

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2. Jan 3, 2016

### Staff: Mentor

The previous line is $\Delta{t}_0=\Delta{t}_s+\frac{v\Delta{t}_0}{u}$. It's just algebra from there.

3. Jan 3, 2016

### Erland

Solve for Δt0 in the first equation at the attached image.

4. Jan 3, 2016

### Tim541541

Thank you Nugatory for reply. Can you tell me is that delta t sub o will be mentioned as 1 here ? Actually i just really wanna understand algebra behind it.

5. Jan 3, 2016

### Staff: Mentor

I'm sorry, but I don't understand what you mean by "will be mentioned as 1 here".... The algebra is, as Erland says above, just solving for $\Delta{t}_0$.

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