18
ί ˲
.
, , , , .
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(1), (2), (3). (5). , , (1). (4); 䒺 (6), , , (, , ).
(5) ᒺ (1). ij , . , :
= 2A cos kx cosωt, (1)
2½Acos kx½ = ,
- ,
k = 2π/λ - ,
λ - ,
ω - .
, . , , (. .2).
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:
2Acoskx = 0. (2)
kx = (2n 1)(π /2), , k = 2π/λ, :
x = (2n 1)(λ /4) = xn, (3)
n = 1,2,
, xn, (3) ( ) (..2).
г :
xn+1 xn = L = λ. (4)
ν λ :
ν = vt /λ, (5)
vt - .
³, :
vt = vo , (6)
v0 - t=00,
α - .
(6), (λ = 2λ = 2L), :
ν = . (7)
:
. 3.7.
1. . 1.
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2.ϳ䒺 220 .
3. 6, .
4. ν1
(, , ).
5. , .1 , ( -
xn, n = 1, 2, 3, 4). . . 2.
6. (4) :
L1 = x2 x1, L2 = x3 x2, L3 = x4 x3
, :
.
7. L, :
ΔL1 = | L L1|, ΔL2 = | L L2 |, ΔL3 = | L L3 |.
8. , .6,7, .2.
9. (, , ), 䳿, 4 8.
10. (7) ν1, ν2, ν3, : , , .2.
11. .2.
t=00 C v0 = 332 /,
= 0,00366 -1
G | L Ѳ. |