2. Sample Papers
  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-32

  • question_answer
    A radar has power of 1kW and is operating at a frequency 10 GHz. It is located on a steep mountain of height 600 m. The maximum distance up to which it can detect an object on the surrounding earth surface is :

    A) 87.6 km    

    B)   26.4 km

    C) 43.5 km  

    D)                    15.2 km

    Correct Answer: A

    Solution :

    The maximum distance upto which the radar can detect the object is                 \[\sqrt{2Rh}\,=\sqrt{2\times 600\times 6400\times {{10}^{3}}}\] \[=87.6\times {{10}^{3}}\,m=87.\,6\,km\]


You need to login to perform this action.
You will be redirected in 3 sec spinner