Speed of a moving observer toward stationary source (sound frequency)

[rechitzy]

Homework Statement

A stationary whistle emits a sound of 190 Hz. If a car hears the whistle with a frequency of 198 Hz, how fast was it moving (in m/s)? Use 340 m/s for the sound velocity

Homework Equations

f'=(1+Vo/V)f ======>>>> equation for the observer moving toward stationary source.

The Attempt at a Solution

f'=(1+Vo/V)f

198=(1+Vo/340)190

please help! what am i doing wrong?

 

[nickjer]

What did you get for your answer?

 

[rechitzy]

i got 353.3157

 

[nickjer]

Well, then you made a mistake in your math. I believe your equation is right, but you seem to be messing up when solving the algebra. Your velocity should not be that fast.

 

[rechitzy]

ok i believe i did the 198/190 times 340 -1 is that right?

 

[vela]

No, it's not.

 

[rechitzy]

ok i got a different answer now 14.3157 is this one right?

 

[rechitzy]

it was right, thank you soooo much for your help.. can you please help me with this one?
https://www.physicsforums.com/showthread.php?t=399693