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When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emittedfrom the target. Which of the following wavelength is absent in the X-ray spectrum, if the X-raytube is operating at 40,000 volts-79.RPMT 2002](a) 0.25 A(b) 0.5 A(c) 1.5 A(d) 1.0 A

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