Answer:
a) 
b) 
c) 
d) 
Explanation:
Given:
- velocity of the sound from the source,

- original frequency of sound from the source,

- speed of the source,

(a)
We know time period is inverse of frequency:
Mathematically:



(b)
Distance travelled by the motorcycle during one period of sound oscillation:



(c)
The distance travelled by the sound during the period of one oscillation is its wavelength.



(d)
observer frequency with respect to a stationary observer:
<u>According to the Doppler's effect:</u>
...........................(1)
where:
are the observed frequency and the velocity of observer respectively.
Here, observer is stationary.

Now, putting values in eq. (1)

