Transcript ch40a.ppt

A particle is in a finite potential well, and it can have any
one of 5 quantized energy values and no more. What
would allow it to have possibly a 6th energy level?
e
th
e
th
e
w
el
lw
id
w
M
er
e
ak
ll
na
e
th
rr
e
ow
w
er
el
ls
ha
llo
w
er
o.
..
er
gy
en
th
e
e
ak
M
se
re
a
ec
D
cr
ea
In
0 of 5
se
th
e
en
er
gy
of
...
3.
4.
5.
20% 20% 20% 20% 20%
ak
2.
Increase the energy of
the particle
Decrease the energy of
the particle
Make the well wider
Make the well narrower
Make the well shallower
M
1.
30
A particle moving from the left to the right with energy E
encounters a barrier with U>E. The particle tunnels
through the barrier. Its wavelength after the barrier:
1. Is the same as
before the barrier
2. Is smaller after
the barrier than
before
3. Is larger after the
barrier than
before
fte
rt
he
rg
er
a
af
te
r
Is
la
le
r
sm
al
Is
ba
rr
i.
r..
.
th
e
ba
fo
re
...
be
as
e
sa
m
th
e
Is
0 of 5
.
33% 33% 33%
30