To raise the pitch of a stringed musical instrument the player can
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(d) Higher pitch means higher frequency
Frequency of a stringed system is given by
$n = \frac{p}{{2l}}\sqrt {\frac{T}{m}} \Rightarrow n \propto \frac{{\sqrt T }}{l}$
Hence, to get higher frequency (higher pitch) tension should be increase and length should be shorten.
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