A road side building has two doors on the same wall which is made up of sound proof material. Two persons (A & B) are standing on a same line perpendicular to the wall of the building and is 150m away from the wall. The distance between the two persons is 20m. If a sound horn from a vehicle is horrible for person A and barely audible for person B ( Assume first order minima). Find the distance between the doors? The wavelength of the sound is 3m.

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Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.