exam1 - 10 3 m 2 . An electron drift velocity of 10 5 cm/s...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
NAME: Exam 1 ECEN 370 Problem 1 Consider an electron trapped in a one-dimensional infinite-potential well of width 0 . 8 nm. The electron can be excited to higher energy states by absorbing energy from incident photons. Calcu- late the wavelengths (in nm) of two lowest-energy photons capable of exciting the electron from the ground state . Problem 2 The free-electron concentration of a material is 10 19 cm - 3 . Suppose a voltage of 5 V is applied across this material of length 500 μ m and cross-sectional area
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 10 3 m 2 . An electron drift velocity of 10 5 cm/s is obtained. Calculate ( a ) the electric eld intensity in the material, ( b ) the electron mobility, ( c ) the conductivity of the material, and ( d ) the resistance of the sample. Problem 3 The electron density of a material is N e = 10 27 m-3 and the permittivity is = 8 . 854 x 10-12 F/m. At a wavelength of 1 m, is the material transparent? (Explain!)...
View Full Document

Page1 / 4

exam1 - 10 3 m 2 . An electron drift velocity of 10 5 cm/s...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online