Which of the following statement/statements about the wave's properties is/are CORRECT? (it may be more than one option) When we feed two slightly different frequencies separately to our left and right ear, we can hear a frequency equal to the difference between the two frequencies. The phenomenon is called the binaural effect. Humans can generally hear frequencies ranging from 20 Hz - to 20,000 Hz. Moreover, our ears perceive sound intensity uniformly at different frequencies within the range mentioned above. Doppler effect changes the observed frequency due to the relative motion between the source and the observer. The principle of active noise cancellation is based on the brain's psychological effect to filter the unwanted surrounding noise.