Physics Homework Help PLEASE!?

Question

Please only answer this if you are positive of the answer. I am in Honors Physics. I need help with my homework dealing with Resonanve and Standing Waves. The first question is exactly this:
The speed of sound is 340 meters per second ^2. If one piece of a cut straw is 0.15 m in length what is the wavelength of the standing wave in the straw when the bottom hole of the straw was NOT covered?

What was the frequency of that wave?

What was the wavelength of the standing wave inside the tube when the bottom hole WAS covered?

Can someone please help me with these 3 problems? From there, I should be fine, but I just need help on the first couple. Thank you.

That's supposed to be Resonance and Standing waves. Sorry, typo. My bad.

Thank you Edward. That helped a little, but those equations have not yet been introduced to us in Physics (I am only 14). Perhaps there is an alternative way to solve this problem that I am not seeing.

Answer 1

Please first go to the link below

v=340 meters per second

We have on open pipe when the bottom of the straw is not covered

f=n(v/2L)
f= n(340/(2x.15))
f=1133 n Hz (n- specifies the harmonic)

closed
then f= nv/(4L)
f=567 n Hz
v=wf w - wavelength
w= v/f= 340/ 567 n
w=0.6/n

Or this is a basic as it gets http://hyperphysics.phy-astr.gsu.edu/hbase/class/phscilab/restube2.html

Open (http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l5c.html)
f= v/(2L)=340/(2 x .15)

Closed (http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l5d.html)
f=v/(4L)=fw/(4/L)
w= 4L= 4(.15)=.6m

Let me know what gives you problems. The fundamental concept is

Speed of propagation equal to the product of frequency and wavelength
v= f w
In close resonating pipe we can have integer multiples of 2L

while for the closed pipes
multiples of 4L