An Observer Is Standing on the Platform of a Railway

question 155

Multiple Choice

An observer is standing on the platform of a railway station. A train goes through the station without stopping. If the frequency of the train whistle decreases by a factor of 1.2 as it approaches and then passes him, calculate the speed of the train assume the speed of sound in air is 343 m/s) .

• A) 112 km/hr
• B) 31.2 km/hr
• C) 56.0 km/hr
• D) 62.0 km/hr
• E) 122 km/hr

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Cohort Effect

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