व्हिच ऑफ द फॉलोइंग इज रिक्वायरमेंट फॉर रेगुलर रिफ्लेक्शन ऑफ साउंड
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When sound travels in a given medium, it strikes the surface of another medium and bounces back in some other direction. This phenomenon is called the reflection of sound. During reflection, the frequency, speed and wavelength of the wave do not change.
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