Exam 15: Traveling Waves and Sound

A glass window is installed in the window space and the intensity level of the sound entering through the window is reduced from 72 dB to 47 dB.The factor,by which the acoustic power entering the chamber is reduced by the glass window,is closest to:

A wire,1.0 m long,with a mass of 90 g,is under tension.A transverse wave is propagated on the wire,for which the frequency is 890 Hz,the wavelength is 0.10 m,and the amplitude is 6.5 mm.The tension in the line,in SI units,is closest to:

Light from a laser forms a 1.31 mm diameter spot on a wall.If the light intensity in the spot is 3.69 x 10⁴ W/m²,what is the power output of the laser?

If a rocket is traveling toward a mountain at 1/2 the speed of sound,the sound waves from this rocket's engine approach the mountain at 1 1/2 times the speed of sound.

Which of the following forms is not a solution of the wave equation?