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**Standing Waves help!!!! 30 mins left.**

Hello everyone who's here, so far I've been doin great on waves, but what the heck is standing eave?

Here is a problem that I kinda get, but not completely:

Two strings, with the same mass/length m oscillate with the same frequency f=2.00 Hz. The first string has length L1, tension T1 and vibrates in the fundamental mode (n=1). The second string has length L2, tension T2 and vibrates in the third harmonic (n=3). Assuming L2=2.30 L1:

a) What is the ratio T1/T2?

b) What would be the frequency of the second string if it oscillates in the mode n=1?

what the hell is fundamental mode?

please help, or at least give hints,

thanks a lot