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AFMC AFMC Solved Paper-2000

  • question_answer
    The speed of a wave in a medium is 650 m/s. If 4000 waves are passing through a point, in the medium in 1.67 min, then its wavelength will be :

    A)  25.16m                               

    B)  16.25m

    C)  32.50m                               

    D)  8.25m

    Correct Answer: B

    Solution :

                     Wavelength is defined as the distance between repeating units of a wave pattern. It is related to frequency and velocity as \[\text{Wavelength = }\frac{\text{velocity}}{\text{frequency}}\] Given, Time t = 1.67 min. = 100 s Frequency of wave is \[n=\frac{4000}{100}=40\,per\,\sec \] Wavelength of wave is \[\lambda =\frac{v}{n}=\frac{650}{40}=16.25\,m\]


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