the entire statement is true and correct.

there's no diagram, nothing is illustrated, and no question is asked.

Ibelieve your answer is b.hope this : )

156.96691 Hz

Explanation:

f' = Actual frequency

v = Velocity of sound in air = 343 m/s

= Relative velocity of train = 7.1 m/s

= Beat frequency = 6.5 Hz

Receding frequency

Approaching frequency

Beat frequency is given by

Actual frequency of the train whistle is 156.96691 Hz

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