The figure shows a loudspeaker A and point C, where a listener is positioned. [AC| = 4.50 m and the angle 8 = 42 °. A second loudspeaker B is located somewhere to the left of A. Both speakers vibrate in phase and are playing a 69.0 Hz tone. The speed of sound is 343 m/s. Excluding point (A), what is the fourth closest to speaker A that speaker B can be located, so that the listener hears maximum sound?

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Q: why is pluto not a planet

A: Tombaugh discover pluto  in 1930. From 1930 to 2006 .

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Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.