The answer is A John Roebling.
I know you are Indian by your question, HC Verma class 9 or 11 !!
if you got any problem, comment !!
Answer:
Part a)
f = 371.1 Hz
Part b)
f = 417.7 Hz
Part c)
beat frequency = 46.6 Hz
Explanation:
Part a)
Due to doppler's Effect the frequency of the sound heard by the train which is moving away from the observer is given as
Part b)
Now from the second train which is approaching the person we can say
Part c)
As we know that beat frequency is the difference in the frequency from two sources
Speed = d/t
d = 200, t = 10
200/10 = 20
Solution: 20 m/s
Answer:
The student which is correct is Anya
Explanation:
The wavelength of a wave is the length of one complete wave cycle and it is represented by Greek letter lambda (λ)
The frequency of a wave is the number of waves (complete wave cycles) passing a given point over a given time period and the frequency is represented by the Greek letter nu (ν) and also as "f" (which is the first letter of the word "frequency")
Therefore, the speed, "v", (different from nu (ν)) of the wave is given as follows;
v = f × λ
From which we have;
λ = v/f
∴ λ ∝ 1/f
Which indicates an inversely proportional relationship between the wavelength and the frequenct
From which we have that as the wavelength decreases, the frequency increases
Therefore, Anya decrease increase is correct
