We want to explain why two different observes may measure different frequencies for the same vibrating object.
We will see that the two correct options are:
- <em>Observer A is stationary and Observer B is moving.</em>
- <em>Observer A and Observer B are moving at different speeds relative to each other.</em>
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Let's assume that the vibrating object is a guitar string. Thus, the string makes a noise, and from that noise, we can estimate the frequency at which the string vibrates.
Now there appears a really cool effect, called the Doppler Effect. It says that the apparent change of frequency is <u>due to the motion of the observer or the source of the frequency (or both).</u>
For example, if you move towards the vibrating string, the perceived frequency will be larger, and you will hear a "higher" sound.
While if you move away from the string, the opposite happens, and you will hear a "lower" sound.
Then the only thing that impacts in how we perceive the frequency is our velocity relative to the source.
So, why do observers A and B measure different frequencies?
The two correct answers are:
- <em>Observer A is stationary and Observer B is moving.</em>
- <em>Observer A and Observer B are moving at different speeds relative to each other.</em>
If you want to learn more, you can read:
brainly.com/question/17107808
