question 4 A riverside warehouse has two open doors, as in the figure below. Its

Question

question 4

A riverside warehouse has two open doors, as in the figure below. Its interior is lined with a sound-absorbing material. A boat on the river sounds its horn. To person A, the sound is loud and clear. To person B, the sound is barely audible. The principal wavelength of the sound waves is2.50m. Assuming person B is at the position of the first minimum, determine the distance between the doors, center to center.
m

question 4 A riverside warehouse has two open doors, as in the figure below. Its interior is lined with a sound - absorbing material. A boat on the river sounds its horn. To person A, the sound is loud and clear. To person B, the sound is barely audible. The principal wavelength of the sound waves is2.50m. Assuming person B is at the position of the first minimum, determine the distance between the doors, center to center.

Explanation / Answer

fringe width =D/d

D=150 , =2.5 , d =distance between the doors,

20=2.5*150/d

d= 18.75 m

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