When we put our ear to a railway track, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through air. Why?

Question

TextSpeed of Sound in Different Media

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Attempt either (I) with all sub parts or (II) with all sub parts from the following two questions-

The speed of sound in air is 340 m/s. If a sound wave has a frequency of 1700 Hz, what is its wavelength?

MCQ (Single)Relationship Between Wavelength, Frequency and SpeedSpeed of Sound in Different Media

Explain why sound travels faster in water than in air. Include a brief explanation related to the medium's properties.

An object moving at a speed greater than that of sound is said to be moving at

Explain how 'echo' is produced.

What should be the minimum distance between the listener and the reflector to hear an echo of sound propagating with a speed v m s⁻¹?