A standing wave is oscillating at 690 Hz on a string, as shown in ...

[mynx]

A standing wave is oscillating at 690 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string?
 
  A) 280 m/s
  B) 410 m/s
  C) 210 m/s
  D) 140 m/s

Question 2

A 1.0-g string that is 0.64 m long is fixed at both ends and is under tension. This string produces a 100-Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. The tension in the string, in is closest to
 
  A) 2.8 N.
  B) 2.3 N.
  C) 1.8 N.
  D) 3.4 N.
  E) 3.9 N.

[JaynaD87]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: A

[mynx]

Thank you!

[JaynaD87]

Always glad to help...