A) 857 Hz
B) 807 Hz
C) 750 Hz
D) 1143 Hz
Correct Answer: C
Solution :
(c) |
\[{{f}_{app}}=\left( \frac{V-0}{V-50} \right){{f}_{source}}\] |
\[1000=\left( \frac{350}{300} \right){{f}_{source}}\] |
\[{{f}_{source}}=\frac{1000\times 300}{350}\] |
\[{{f}_{app}}=\left( \frac{V}{V+50} \right).{{f}_{source}}\] |
\[=\frac{350}{400}\times 1000\times \frac{300}{350}\]\[=750Hz\] |
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