Answer:
Frequency is more
Explanation:
If there is a apparent change in the frequency of sound due to the relative motion between the observer and the source, it is called doppler effect.
The formula for the doppler effect is
\(f' = \frac{v-v_{o}}{v-v_{s}}f\)
Where, f be the original frequency, f' be the apparent frequency, v be te speed of sound, v0 be the speed of observer and vs be the speed of source.
So, as observer at rest, vo = 0
\(f' = \frac{v}{v-v_{s}}f\)
Here, f' > f
So, the frequency of sound heared y the observer is more.
