Sound source A is located at x = 0, y = 0, and sound source B is located at x = 0, y = 2.3 m. The two sources radiate coherently and in phase. An observer at x = 17.8 m, y = 0 notes that as he takes a few steps from y = 0 in either the +y or −y direction, the sound intensity increases. What is then the lowest frequency and next to lowest frequency of the sources that can account for this observation? (Enter your answers from smallest to largest.)

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Ответ:

ianball025

11.02.2021

Physics

305.52 s

Explanation:

Given

Resistance of conductor $R=30 \Omega$

mass of water m=500 gm

Initial Temperature $T_i=30^{\circ}C$

Final Temperature $T_f=100^{\circ}C$

specific heat $c=4.19\times 10^3 J/kg-^{\circ}C$

Heat required to heat water $Q=mc\Delta T$

$Q=0.5\times 4.19\times 10^3\times (100-30)$

$Q=146.65\times 10^3 J$

Heat generated by stove in time t

$H=\frac{V^2}{R}\times t$

$H=\frac{120^2}{30}\times t$

$\frac{120^2}{30}\times t=146.65\times 10^3$

$t=\frac{146.65\times 10^3\times 30}{120^2}$

$t=305.52 s\approx 5.09 min$

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