Question

please solve c

2. Explain what is meant by diffraction of waves and describe two examples of when wave diffraction is useful. [3 a. b. A loudspeaker is circular in shape with a diameter of 0.15m. Using the principle of diffraction from a circular aperture, calculate the angle at which the first minimum occurs when; i. sound of frequency 3400 Hz is emitted li. sound of frequency 10 KHz is emitted Take the speed of sound in air to be 340 ms 1) [5) If the speaker is in a large room and placed 3m from a listener, calculate the width of the central noise maxima in meters heard for both frequencies. [4] c. Use these answers to explain one reason why woofers (larger diameter speakers for lower frequencies) and tweeters (smaller diameter speakers for higher frequencies) are often both included within speaker cabinets to improve sound quality around a large room. [2) d.

Answer 1

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