1
Question
A sound wave passes from a medium A to a medium B. The velocity of sound B is greater than that in A. Assume that there is no absorption or reflection of the boundary. As the wave moves across the boundary, the ................
A sound wave passes from a medium A to a medium B. The velocity of sound B is greater than that in A. Assume that there is no absorption or reflection of the boundary. As the wave moves across the boundary, the ................
Open in App
Solution
The correct option is A Wavelength of sound will increase
Answer is B.
Frequency is the number of wavelengths of wave crossing a point per unit time. As the wave length increases there will be lesser number of them crossing a point so this would decrease the frequency. Here, to keep the frequency same, the velocity of wave is increased so that number of wavelengths of wave crossing a point remains same. As the wavelength increases velocity has to increase so as to keep frequency same.
Hence, as the wave moves across the boundary, the wavelength of the sound increases.
Answer is B.
Frequency is the number of wavelengths of wave crossing a point per unit time. As the wave length increases there will be lesser number of them crossing a point so this would decrease the frequency. Here, to keep the frequency same, the velocity of wave is increased so that number of wavelengths of wave crossing a point remains same. As the wavelength increases velocity has to increase so as to keep frequency same.
Hence, as the wave moves across the boundary, the wavelength of the sound increases.
Suggest Corrections
0
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
