One source of sound moves towards stationary listener with a speed, (1)/(10)times speed of sound. Ratio of frequency of sound heard by listener to that emitted from source is .......

One source of sound moves towards stationary listener with a speed, (1

1.	One source of sound moves towards stationary listener with a speed, (1)/(10)times speed of sound. Ratio of frequency of sound heard by listener to that emitted from source is .......
Answer» `10/9` `11/10` `((11)/(10) )^(2)` `((9)/(10)) ^(2)` SOLUTION : We have, `(f _(L))/( V+ v _(L)) = (f _(S))/( v +v _(S))` `therefore (f _(L))/( f _(S))= (v + v _(L))/( v + v _(S)) = (v + 0)/( v - (v)/( 10 )) = (v)/( 9v//10 ) = (10)/(9)`