Doppler effect: apparent frequency when only the source or only the observer moves towards the other

1. A.
   5%
2. B.
   10%
3. C.
   20%
4. D.
   25%

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1. A.
   same in both cases.
2. B.
   more in the second case than in the first case
3. C.
   less in the second case than in the first case.
4. D.
   less than the actual frequency in both cases.

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1. A.
   10:9
2. B.
   11:10
3. C.
   $(11)^2:(10)^2$
4. D.
   $(9)^2:(10)^2$

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1. A.
   $5\%$
2. B.
   $10\%$
3. C.
   $20\%$
4. D.
   $25\%$

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1. A.
   $\frac{10}{9}$
2. B.
   $\frac{11}{10}$
3. C.
   $\left( \frac{11}{10} \right)^{2}$
4. D.
   $\left( \frac{9}{10} \right)^{2}$

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1. A.
   $440$
2. B.
   $480$
3. C.
   $500$
4. D.
   $540$

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1. A.
   $400$
2. B.
   $500$
3. C.
   $444$
4. D.
   $555$

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