When a detonator is exploded on a railway line made by steel, an observer standing on
the rail 2 km away hears two sounds. what is the time interval between these two
sounds? (given, young's modulus of steel = 2 x 1011nm-2
density of steel = 8000kgm , density of air 1.4kgm-3,7 for air = 1.4 ,
?,
atmospheric pressure = 105nm-2