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AMU Medical AMU Solved Paper-2006

  • question_answer
    An astronaut is approaching the moon. He sends out a radio signal of frequency 5000 MHz and the frequency of echo is different from that of the original frequency b) 100 kHz. His velocity of approach with respec- to the moon is

    A)  2km/s                                 

    B)  3 km/s

    C)  4 km/s                                

    D)  5 km/s

    Correct Answer: B

    Solution :

                     Bulk modulus \[K=\frac{\Delta p}{\frac{-\Delta V}{V}}\]                 \[v=\frac{\Delta \,V}{V}=\frac{0.01}{100}={{10}^{-4}}\] \[\Delta p=\] pressure of water                 \[=h\rho g\]                 \[={{10}^{3}}\times 1\times {{10}^{3}}\times 9.8\] \[\Delta \,p=9.8\times {{10}^{6}}\]                 \[K=\frac{9.8\times {{10}^{6}}}{{{10}^{-4}}}\]                 \[=9.8\times {{10}^{10}}N/{{m}^{2}}\]


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