Waves Part 1

As source and detector move away from each other as shownbelow

← Source

‌

→ Detector

vs= velocity of source with respect to ground
= 20 m/s
vd= velocity of detector with respect to ground
= 20 m/s
According to Doppler’s effect,
fapparent=

f(vsound−vd)

(vsound+vs)

⇒1800=

f(340−20)

(340+20)

1800=f(

320

360

)
f=

1800×36

32

=

1800×9

8

=

16200

8

⇒f=2025‌Hz