Homework Help: Physics HELP!!

Posted by joane on Wednesday, November 21, 2012 at 11:41am.

a). What is the wavelengh of a 2.54MHz ultrasound wave travelling through aluminum?(the speed of sound in aluminum is 6420 m/s)

b). What frequency of electromagnetic wave would have the same wavelength as the ultrasound wave above?

Physics HELP!! - drwls, Wednesday, November 21, 2012 at 12:40pm
a) frequency x wavelength = (wave speed)
2.54*10^6 * wavelength = 6420 m/s

Solve for the wavelength

b) Use the same formula, but with 3.00*10^8 m/s (the "speed of light") for the wave speed, and the previous answer for the wavelength.
Physics HELP!! - joane, Saturday, November 24, 2012 at 3:16pm
I am not getting the right answer for part b !
I dont know why though! :(

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