A train approaches a stationary observer, with a velocity of \(\dfrac{1}{20}\) of velocity of sound. A sharp blast is blown with the whistle of the engine at equal intervals of one second. the interval between the successive blasts as heard by the observer is

A train approaches a stationary observer, with a velocity of \(\dfrac

1.	A train approaches a stationary observer, with a velocity of \(\dfrac{1}{20}\) of velocity of sound. A sharp blast is blown with the whistle of the engine at equal intervals of one second. the interval between the successive blasts as heard by the observer is
A.	\(\dfrac{1}{20}s\)
B.	\(\dfrac{1}{10}s\)
C.	\(\dfrac{19}{20}s\)
D.	\(\dfrac{20}{19}s\)
Answer» D. \(\dfrac{20}{19}s\)