Odpowiedź :
Odpowiedź:
vo=20m/s
f=1000Hz
vd=340m/s
fo=f[(vo+vd)/vd]
fo=1000Hz*[(20m/s+340m/s)/340m/s]
fo=1058,8Hz
fo≈1059Hz
[tex]Dane:\\v_{o} = 20\frac{m}{s}\\v = 340\frac{m}{s}\\f_{o} = 1000 \ Hz\\Szukane:\\f = ?\\\\f = \frac{v+v_{o}}{v}\cdot f_{o}\\\\f = \frac{340\frac{m}{s}+20\frac{m}{s}}{340\frac{m}{s}}\cdot1000 \ Hz\\\\f = \frac{360}{340}\cdot1000 \ Hz\\\\f = 1,0588\cdot1000 \ Hz\\\\\boxed{f \approx 1 \ 059 \ Hz}[/tex]