Thread: Need help with two questions

1. Need help with two questions

A guitar string has a length of 0.40m and is held fixed with both edges under tension. When it’s plucked, it oscillates with a fundamental frequency of 300 Hz. What wavelength does the wave on the string have?

Is the working just meant to be L=wavelength/2 (the fundamental frequency formula), so 0.8m?

And also, to convert from photons.cm^-2.s^-1 (photons per square cm per second) to photons.m^-2.s^-1 (photons per square m per second), would you convert from cm to m or square cm to square m? Would I divide by 100 or 10000 essentially?

2. Re: Need help with two questions

1cm = 1e-2 m
1cm^2 = 1e-4 m^2
1cm^-2 = 1e4 m^-2

You multiply by 10,000.

3. Re: Need help with two questions

Originally Posted by blyatman
1cm = 1e-2 m
1cm^2 = 1e-4 m^2
1cm^-2 = 1e4 m^-2

You multiply by 10,000.
Thank you that makes sense now!

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