An opera singer in a convertible sings a note at 700 hz while cruising down the highway at 83 km/h . the speed of sound in the air is 343 m/s. part a what is the frequency heard by a person standing beside the road in front of the car?

In meters per second, the singer is traveling ...

... 83 km/h × (1 h)/(3600 s) × (1000 m)/(1 km) ≈ 23 1/18 m/s

Then the observed frequency is ...

... f' = 343/(343 -23.056)·700 Hz ≈ 750.4 Hz

the answer would be c. motion and direction

i hope this : )

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

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experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.