Answer:
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Explanation:
is obviously the correct answer they are both so different yet so alike
Better weight distribution and more stability
The correct answer is:
<span>C) The actual frequency of the siren does not change despite appearances.
In fact, Bob will observe an increase in the apparent frequency as the emergency vehicle approaches him, while Jill will observe a decrease in the apparent frequency as the emergency vehicle moves away from him, because of the Doppler effect (the relative velocity between the observer and the source of the sound is changing), but this effect involves the apparent frequency, while the real frequency of the siren will remain the same.</span>
What is he minumum coating of thickness needed to ensure that lifght of waveelntght 5660 mbnd si
