Answer:
B ) 1.5 m/s
Explanation:
For the apparent frequency reflected by enemy submarine , the Doppler effect formula is
F = F₀ ( V + v) / (V - v)
F anf F₀ are real and apparent frequency , V and v are velocity of sound and velocity of enemy submarine respectively.
ΔF / F₀ = [tex]\frac{2\times v}{V -v}[/tex]
Put ΔF = 200; F₀ = 100000 and V = 1482
200 / 100000 = [tex]\frac{2\times v }{1482-v}[/tex]
v = 1.5 m s⁻¹ .
