Sound is incident on a doorway of width 30 cm. The sound passing though the door

Question

Sound is incident on a doorway of width 30 cm. The sound passing though the doorway is detected by a listener 9 m away. As the doorway width is decreased, A. the width of the pattern heard by the listener remains the same. B. the width of the pattern heard by the listener at first decreases but then increases. C. the width of the pattern heard by the listener continuously decreases. D. the width of the pattern heard by the listener continuously increases. E. the width of the pattern heard by the listener increases and then decreases.

Explanation / Answer

As the doorway width is decreased (C) the width of the pattern heard by the listener continuously decreases

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