A riverside warehouse has two open doors as shown in Figure. Its walls are lined with 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 barely audible. The principal wavelength of the sound waves is `2 m`. Assuming person B is at the positon of the first minimum, determine the distance `Ab = 20 m` and the distance of A from the doors is `150 m. A. `7.5 m`B. `15 m`C. `5 m`D. `10 m`

A riverside warehouse has two open doors as shown in Figure. Its walls

1.	A riverside warehouse has two open doors as shown in Figure. Its walls are lined with 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 barely audible. The principal wavelength of the sound waves is `2 m`. Assuming person B is at the positon of the first minimum, determine the distance `Ab = 20 m` and the distance of A from the doors is `150 m. A. `7.5 m`B. `15 m`C. `5 m`D. `10 m`
Answer» Correct Answer - A `(lambda D)/(2d) = AB = 20 m` where `lambda = 2 m` `D = 150 m` `:. d = 7.5 m`

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