A person standing away from a stationary train places one ear on the steel rail while…

PHYSICS · Single correct · CBSE · Physics · Sound · Sound

Problem

A person standing 1.32 km1.32\,\text{km} away from a stationary train places one ear on the steel rail while keeping the other ear in the air. If the train blows its horn, how many seconds earlier will the sound reach the ear on the rail than the ear in the air? \newline (Take speed of sound in steel =5200 m/s=5200\,\text{m/s} and in air =340 m/s=340\,\text{m/s}.) (a) About 0.25 s0.25\,\text{s} (b) About 4.1 s4.1\,\text{s} (c) About 3.6 s3.6\,\text{s} (d) About 2.8 s2.8\,\text{s}

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