, . , .
. (. 33). (). .
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7)
8. : .
( ):
1/25000 4 ;
1/10000 1 ;
1/5000 2 .
, ms . .
- . t D=vt (1).
(mD/D)2=(mv/v)2+(mt/t)2 (2).
D=1 mD/D=1/400000.
(mv/v)2=1/2(mD/D)2 => mv=15 / .
mt/t=1/(400000*√2) => mt/(D/v)=1/650000 => mt=6*10-11 c.