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The wave function (in \( S I \) unit) for a light wave is given as \( \Psi(x, t)=10^{3} \sin \pi\left(3 \times 10^{6} x-9 \times 10^{14} t\right) \quad \) The frequency of
\( \mathrm{P} \) the wave is equal to
[AMU (Med.) 2012]
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(a) \( 4.5 \times 10^{14} \mathrm{~Hz} \)
(b) \( 3.5 \times 10^{14} \mathrm{~Hz} \)
(c) \( 3.0 \times 10^{10} \mathrm{~Hz} \)
(d) \( 2.5 \times 10^{10} \mathrm{~Hz} \)
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