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Railways RRB (Assistant Loco Pilot & Technician) Solved Paper-2 (2014)

  • question_answer
    A sound wave of wavelength 90 cm in glass is refracted into air. If the velocity of sound in glass is 5400 m/s, the wavelength of the wave in air is

    A)  55 cm                        

    B)  5.5cm

    C)  55m                           

    D)  5.5m

    Correct Answer: B

    Solution :

    Velocity = Frequency x Wavelength In glass, \[5400\times 100=n\times 90\] \[\Rightarrow \]            \[n=\frac{5400\times 100}{90}cps\] in air \[\frac{330\times 100}{\lambda }=n=\frac{5400\times 100}{90}\] \[\therefore \]    \[\lambda =\frac{330\times 100\times 90}{5400\times 100}=5.5cm\]


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