We will hear the sound of siren of frequency 1553.4606 Hz.
The apparent change in wave frequency brought on by the movement of a wave source is known as the Doppler effect. When the wave source is coming closer and when it is moving away, the perceived frequency changes. The Doppler effect explains why we hear a passing siren's sound changing in pitch.
according to Dopplers Effect,
[tex]f'=[\frac{v + v_{0} }{v - v_{s} } ]f[/tex]
[tex]f'= [\frac{700+68.1}{700-94.8} ]* 1224[/tex]
[tex]f'= 1553.4606 Hz[/tex]
the frequency would be 1553.4606 Hz.
to learn more about Doppler Effect go to - https://brainly.com/question/9165991
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