Modern Physics: Mastering Physics: ± Accelerating Electrons

Part A

Through what potential difference DeltaV

must electrons be accelerated (from rest) so that they will have the same wavelength as an x-ray of wavelength 0.160

Use 6.63×10⁻³⁴ $J \cdot s$ for Planck's constant, 9.11×10⁻³¹

for the mass of an electron, and 1.60×10⁻¹⁹

for the charge on an electron.

ANSWER:

58.8

$\rm V$

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

Use 6.63×10⁻³⁴ $J \cdot s$ for Planck's constant, 3.00×10⁸ m/s

for the speed of light in a vacuum, and 1.60×10⁻¹⁹

for the charge on an electron.

ANSWER:

7760

$\rm V$

Modern Physics