The Wave Equation Is Written Down in an Exam As \frac

The wave equation is written down in an exam as
$\frac { d ^ { 2 } y } { d x ^ { 2 } } = v ^ { 2 } \frac { d ^ { 2 } y } { d t ^ { 2 } }$ From dimensional considerations we see that

A) v² should be replaced by $\frac { T } { \mu }$ .
B) v² should be replaced by $\sqrt { \frac { T } { \mu } }$ .
C) v² should be replaced by v.
D) v² should be replaced by $\frac { 1 } { v }$ .
E) v² should be replaced by $\frac { 1 } { v ^ { 2 } }$ .

Correct Answer:

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