Explanation Given info: Frequency of the x-ray is 2 × 10 19 Hz . Write an expression to calculate the kinetic energy of the emitted electron. E = e V (1) Here, E is the kinetic energy of the emitted electron e is the charge of electron V is the voltage applied to the x-ray tube. Write an expression to calculate the kinetic energy of the emitted electron. E = h f (2) Here, h is the Planck constant f is the frequency Compare equation (1) and (2) e V = h f (3) Rearrange equation (3) to find the voltage applies to the x-ray tube. V = h f e Substitute 1.602 × 10 − 19 C for e , 6.626 × 10 − 34 m 2 kg/s for h and 2 × 10 19 Hz for f to find V

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Chapter 9, Problem 22E

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The voltage applied on the x-ray tube.

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Chapter 9, Problem 21E

Chapter 9, Problem 23E

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