A) \[{{\left( \frac{9}{10} \right)}^{2}}\]
B) \[\frac{10}{9}\]
C) \[\frac{11}{10}\]
D) \[{{\left( \frac{11}{10} \right)}^{2}}\]
Correct Answer: B
Solution :
Given: \[{{n}_{s}}=\frac{n}{10}\] Apparent frequency \[n=n\left( \frac{\upsilon }{\upsilon -{{\upsilon }_{s}}} \right)\] where n = real frequency ot source \[\upsilon =\] velocity of sound \[{{\upsilon }_{s}}=\] velocity of source So \[\frac{n}{n}=\frac{\upsilon }{\upsilon -\frac{\upsilon }{10}}\] \[=\frac{10}{9}\]
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