Question

Low energy electron diffraction (LEED) is used to study the structure of crystalline surfaces. To study surface this technique requires electrons with wavelength on the order of 5 A. Calculate the voltage required to accelerate an electron to the required velocity such that its wavelength will be 4.9 angstroms ignoring relativistic effects. (answer format X.X)

Answer 1

-By using theores of conservation of energy ev = 1 mv² - 0 e Charge of electron V Voltage m- mass of electron - v Velocity of electron By . using_De Broglie equation a = h = v= h - Using & 2m az = v= 12 2meaz

6.6 x 10-34 2 x.9.1x10-31 x 106x10-19x14.9x10-10)? V = 6.2 volts.
The energy used to accelerate will convert into kinetic energy of the electron.

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