Ch38-p067 - 67(a If m is the mass of the particle and E is its energy then the transmission coefficient for a barrier of height Ub and width L is

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
67. (a) If m is the mass of the particle and E is its energy, then the transmission coefficient for a barrier of height U b and width L is given by 2 , bL Te = where () 2 2 8 . b mU E b h π− = If the change U b in U b is small (as it is), the change in the transmission coefficient is given by 2. bb dT db TU L T U dU dU ∆= ∆ = Now, 2 2 22 8 18 1 . 2 b b b E db m b dU h U E h U E UE π == = −− Thus, . b b U TL T b For the data of Sample Problem 38-7, 2 bL = 10.0, so bL = 5.0 and ( )( ) 0.010 6.8eV 5.0 0.20 . 6.8eV 5.1eV b b U T bL E =− There is a 20% decrease in the transmission coefficient. (b) The change in the transmission coefficient is given by 2 bL dT b e L b T L dL ∆= ∆= − ∆ and
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
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

Page1 / 2

Ch38-p067 - 67(a If m is the mass of the particle and E is its energy then the transmission coefficient for a barrier of height Ub and width L is

This preview shows document pages 1 - 2. Sign up to view the full document.

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