- #1

john merrick

- 7

- 2

- Homework Statement
- A train on a straight track sounds a 400 Hz horn when passing a parked car on

the road. The train is moving at 20 m/s and the temperature is 10°C. Find the

apparent frequency of the horn for a person sitting inside the car when the train

is approaching and when the train is moving away

- Relevant Equations
- no equation

my problem is not how you get the answer... 425.16Hz for approaching. it has to be do the right amount of significant digits.

so it should be 1 significant digit which would mean 400hz. which would make no sense since i started with 400hz.

i'm assuming they should have written the question with a decimal after one of the numbers so you would be looking at 2 or 3 significant digits in your final answer.

so it should be 1 significant digit which would mean 400hz. which would make no sense since i started with 400hz.

i'm assuming they should have written the question with a decimal after one of the numbers so you would be looking at 2 or 3 significant digits in your final answer.