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March 31, 2015

March 31, 2015

Posted by **Anonymous** on Sunday, September 18, 2011 at 11:35pm.

What is the wave speed for a wave of 5 meters wavelength that has a frequency A) 25.6 m/s.

B) 64 m/s.

C) 128 m/s.

D) 640 m/s.

I think its a

A string on a guitar is 0.4 m long and produces 360 Hz as its fundamental tone. If you press on the string so that you reduce its free length to 0.2 m, what tone will it produce?

A) 270 Hz.

B) 480 Hz.

C) 540 Hz.

D) 720 Hz.

I think it is D

You have a tuning fork that produces a frequency of 512 Hz in air. You submerge it in the swimming pool and strike it against the wall underwater. The speed of sound in water is 1500 m/s. What will the resulting frequency and wavelength be?

A) 740 Hz, 3.41 m

B) 740 Hz, 0.773 m

C) 512 Hz, 3.41 m

D) 512 Hz, 2.93 m

- Physics -
**drwls**, Monday, September 19, 2011 at 5:16amIn the first question, you did not provide the frequency.

Your answer to the second question is correct.

In the third question, the frequency remains the same under water and (1500 m/s)/(frequency) is the new wavelength.

- Physics -
**taz**, Wednesday, September 21, 2011 at 1:07ami think the first question the answer is A. wavespeed=frequency x wavelength

freq=128hz

wavelength=5 meters

so multiplied equals 640

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