What is the resulting equation when the expression for y in the second equation is substituted into the first equation?
2 answers:
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Answer:
If a car with a blowing horn is moving toward you, the pitch sounds higher than the actual emitted frequency.
Step-by-step explanation:
In figure,
V= speed of wave
U= speed of car
When car moving towards you, then
Car travels a distance in time T = VT
Wave travels a distance in time T = UT
From figure,
change in wavelength (λ') = VT - UT= T(V-U)
Now,
V = λ' f' (f' →frequency observed by you)
f' = V ÷ λ' =
We know that
= f
Then,
f' =
f' =
Hence, we can say that
frequency increases as source moves toward you.
