Physics-
General
Easy

Question

Wavelength of B.B.C. is 15 m, find the frequency of the waves broadcast by it if velocity of radio wave is 3 × 108 m s–1.

  1. 20 Mhz    
  2. 30 MHz    
  3. 200 Mhz    
  4. 50 MHz.    

The correct answer is: 20 Mhz


    Here, v = 3 × 108 ms–1; = 15 m ; f = ?
    Now, v = f lambda
    or f equals fraction numerator v over denominator lambda end fraction equals fraction numerator 3 cross times 1 0 to the power of 8 end exponent over denominator 15 end fraction
    or f equals 20 cross times 1 0 to the power of 6 end exponent H z equals 20 text  MHz end text

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