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When a pure semiconductor is heated, its resistance
A glass plate 0.9 cm thick has a refractive index of 1.50. How long does it take for a pulse of light to pass through the plate? [c=3.0 x 108 ms-1]
The fundamental frequency of a plucked wire under a tension of 400 N is 250 Hz. When the frequency is changed to 500 Hz at constant length, the tension is
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