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Two strings, $A$ and $B$, have the same tension and length. The string $A$ has a mass $m$ while the string $B$ has a mass Am. If the speed of the waves in string $A$ is $v$, that on string $B$ is

• ✓
  $\frac{1}{2} v$
  
• B
  $v$
  
• C
  $2 v$
  
• D
  $v$,