Part A: Through what potential difference V must electrons be accelerated (from

Question

Part A: Through what potential difference V must electrons be accelerated (from rest) so that they will have the same wavelength as an x-ray of wavelength 0.135 nm ?

Use 6.63×1034 Js for Planck's constant, 9.11×1031 kg for the mass of an electron, and 1.60×1019 C for the charge on an electron. Express your answer using three significant figures.

V = 82.5 V

Part B: Through what potential difference V must electrons be accelerated so they will have the same energy as the x-ray in Part A?

Use 6.63×1034 Js for Planck's constant, 3.00×108 m/s for the speed of light in a vacuum, and 1.60×1019 C for the charge on an electron. Express the answer to 3 sig fits.

........I only need help on part B.

Explanation / Answer

Part B)

E = hc/wavelength = edelta V

substituting we get

deltaV = 9208.3 Volts

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