1. d = 0,1 , 1 =1500 , . 2 = 1000 ? , e = 0,5. .
, dT,
dQ = c m dT, (1)
c ; m .
,
m = r V= 4/3 p r r3, (2)
r ; r - ,
dQ= 4/3 pr r3 c dT, (3)
, , , , -:
dQ= e s T4 S dt = e s T4 4 p r2 dt, (4)
dt , dT. (3) (4),
. (5)
,
t= cr r(1/T23 1/T13)/ 3es. (6)
t = 500 .
2. - l1 = 2,4 l2 = 0,8 . ?
, , , ,
-
R*= s T4,
, R1*/ R2* = (T2/T1)4 = (l1/l2)4.
r*l Tmax = c T5.
r*2max/ r*1max = (T2/T1)5 = (l1/l2)5.
,
R2*/R1* = 81;
r* 2 max/ r* 1 max = 243.
3. l0 =0,8 . - l = 0,4 . , ?
e =hc/l l = 0,4 e = 3,1 . , Tmax= ½ mVmax2. ,
Tmax= ½ m Vmax2 = h c/ l - h c/ l0.
Vmax= (2 h c(l0 - l)/(m l0 l))1/2 .
, Vmax = 0,74×108 /.
U<0 . U, , e U =m Vmax2 / 2.
|
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, U= hc(1/l - 1/l0) /e = 1,58 .
4. - l = 165 . ?
. , , , . , ,
e jmax= m Vmax2 /2.
m Vmax2 /2= hn - A = hc/ l - A,
jmax= (hc/ l - A) /e = 3 .
5. . , j = p/2 .
T e e
T= e - e.
T= e, , e= 2 e,
hc/ l= 2hc/ l,
l / l = 0,5, P= h/ l, P/P = 0,5. ,
.
Θ |
α |
j = 90 Q a. , sinα = P/P = 0,5, α = 300, Q = j - a = 60. l = 0,5 lk,
P= h / 0,5 lk = 2 m0 = 1,02 /.
6. , , , Q= 180.
, .
e= hc/ l=m0c2,
h /m0 c2, P= h /l = m0 c.
l - l = lk ( 1 cos 180 ) = 2 lk,
l= 2 lk + l= 2 h/ (m0 c) + h/ (m0 c) = 3 h /(m0 c).
P= h/ l = m0 c/ 3.
.
, P = -P + mυ
mυ= P + P = 4/3 m0c.
,
mυ = 3,64´10-22 / .
7. λ = 663 . = 0,6 . :
1) F, ;
2) .
1) p S :
F = pS. (1)
= 0 (ρ + 1)/ c, (2)
, 0 ; ; ρ - .
(2) (1),
F = 0 S (ρ + 1)/ c. (3)
|
|
0 S ,
F = (ρ + 1)/ c. (4)
, , ρ= 1:
.
2) ε n1, , , .. : = εn1, ε = h/λ,
= h n1 / λ,
n1= λ / h. (5)
,
n1= 21018 -1.