**** Intensity and spherical waves*****(adsbygoogle = window.adsbygoogle || []).push({});

Sound waves are spreading out equally in all directions from a points source. You measure an intensity of 0.026 W/m2 at a distance of 4.3 m from the source.

a) What is the intensity in a distance of 3.1 m from the source?

b) How much sound energy does the source emit in one hour assuming that the power output stays constant?

******Mathematical description of a wave:******

A transverse wave on a string can be described by:

Y(x,t)= A cos [k(x-vt)]

a) Find the maximum transverse speed vy of a particle of the string. Under that circumstances is it equal to the propagation speed of the wave?

b) The wave has an amplitude of 0.300 cm, wavelength 12.0 cm, and speed 6.00 cm/s. What is its frequency? What is the deflection of a particle of the string at time t = 5 s and position x = 10 cm?

Please help me out!

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# Homework Help: Two simple wave problems.

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