A speaker has a diameter of 0.437 m. (a) Assuming that the speed of sound is 343 m/s, find the diffraction angle e for a 1.64-kHz tone. (b) What speaker diameter D should be used to generate a 4.03-kHz tone whose diffraction angle is as wide as that for the 1.64-kHz tone in part (a)? (a) Number i Units (b) Number i Units

Two identical speakers are initially equal distancesfrom a listener . Thelistener hears a sound maximum (constructiveinterference). When the upper speaker is moved backby a distance d = 2 m, the listener hears a soundminimum (destructive interference). What is thelongest wavelength the soundwaves could have?

An interface is formed between a block of aluminium (with an acoustic impedance of 1.8 x 107 kg m2 s') and a block of copper (with an acoustic impedance of 4.6 x 107 kg m-2 s-1). Longitudinal sound waves travelling through the aluminium are normally incident on the boundary, and are partially reflected. a) What is the ratio of the amplitude of the reflected wave to that of the incident wave? Number b) What is the ratio of the amplitude of the transmitted wave to that of the incident wave? Number c) What percentage of the incident power is transmitted? Number d) What percentage of the incident power is reflected? Number % Ouit P Sove Questi

Satellite TV is broadcast from satellites that orbit 37,000 km above the earth’s surface. Their antennasbroadcast a 15 kW microwave signal that covers most of North America, an area of about 2.5 × 107km2(a) What is the total power that strikes a 46-cm-diameter ground-based dish antenna? [3](b) The dish antenna focuses the incoming wave to a 1.0 cm2 area. What is the amplitude of theelectric field at this focus? [2]