An Observer Is Standing on the Platform of a Railway

question 7

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 = 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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Definitions:

Population Locations

The geographical distribution of individuals or entities within a defined area or group being studied.

Learned Helplessness

A condition in which individuals believe they have no control over their situation and therefore stop trying to change or escape from their circumstances, often leading to decreased motivation and depression.

Learned Optimism

The practice of recognizing and challenging negative thoughts in order to develop a more positive outlook on life and increase resilience.

Explanatory Style

A psychological attribute that indicates how people explain to themselves why they experience particular events, either positive or negative.