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Question

A wave packet with center frequency ω is propagating is dispersive medium with phase velocity of 1.5×103m/s. When the frequency ω is increased by 2%, the phase velocity is found to decrease by 3%. What is the group velocity of the wave packet?

A
0.25×103m/s
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B
1.0×103m/s
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C
0.6×103m/s
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D
0.75×103m/s
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