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Old Sep 14th 2014, 03:29 PM   #1
Junior Member
Join Date: Sep 2014
Posts: 2
Unhappy Wave Motion

I found an interesting problem in my dad's old physics textbook. The textbook doesn't go on into much depth about this topic and I want to know how you would solve this so that I can understand how to do the 20 problems modeled after it.

You invent a new musical instrsument, the phonitar, which combines strings and pipes. You design it such that the fundamental frequencies of the two strings and one closed pipe form a G major chord (G-B-D) on a normal day (20 degrees C). The two strings both have a mass/length density of 0.0082 kg/m and are palced under equal tension of 600 N.

a. How long must the bass string be in order to produce the note that is one obctave lower than the G above middle C as its fundamental frequency?

b. How long must the other string be to produce the D above midddle C note as its fundamental frequency?

c. How long must the closed pipe be to produce a B note as its fundamental frequency (B below middle C)?

You are invited to perform a phonitar concerto at the Siberian Symphony located in Yakutsk. The temperature for today's outdoor performance is a balmy -12.7 degrees Celsius.

d. What fundamental notes do the two strings on your instrument produce on this cold day?

e. What fundamental note does the closed pipe play?

And here is the table with the frequencies:

Note Hz

A# or Bb 233

B 247

Middle C 262

C# or Db 277

D 294

D# or Eb 311

E 330

F 349

F# or Gb 370

G 392

G# or Ab 415

A 440

A# or Bb 466

B 494

C%u2019 524
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