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Least audible sound for most of the human ear is :
Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
Let a tin capillary tube be replaced with another tube of insufficient length then we find that water
Light beam which is highly directional is called:
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
Light houses are places with powerful lights to :
Light travels at the fastest speed in:
Light travels fastest in
Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is
Light travels slowest in