A Locomotive Moving at a Constant Speed Approaches and Then

question 19

Multiple Choice

A locomotive moving at a constant speed approaches and then passes a man standing at a crossing.The frequency of the locomotive's horn as the man hears it

• A)gradually increases and then decreases.
• B)gradually decreases and then increases.
• C)abruptly changes as the locomotive passes.
• D)does not change at all.
• E)produces beats due to the Doppler effect.

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Definitions:

Time Series

It is a sequence of data points indexed in time order, often used to analyze and predict future events based on past trends.

Moving Average

A calculation to analyze data points by creating averages of different subsets of the complete data set.

Cyclical Movement

Fluctuations in business activity experienced over time, usually tied to economic cycles.

Random Variation

The unpredictable changes in data that do not follow a recognizable pattern, often due to random effects or causes.