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An X-ray tube operated at 30 kV emits a continuous X-ray spectrum with a short wavelength limit λmin = 0.414 Å.

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An X-ray tube operated at 30 kV emits a continuous X-ray spectrum with a short wavelength limit λmin = 0.414 Å. Calculate Planck’s constant h if e = 1.602 × 10 –19 C and c = 3 × 108 m/s.

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= 6.63 × 10–34 J-s

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