What's heavier? Feather vs. Brick: All objects fall at the same speed. Air resistance causes the feather to look that it's falling slowly. How interesting is it? Physics always expands our knowledge about the Universe. Interference is a physics phenomena in which two waves combine to generate a new wave of greater, lower, or equal amplitude. Waves that are correlated or coherent with each other, either because they emanate from the same source or because they have the same or nearly the same frequency, create constructive or destructive interference. All sorts of waves, including light, radio, audio, surface water waves, gravity waves, and matter waves, can cause interference. Interferograms are the visuals or graphs that arise. Interference can also happen when two wave trains are travelling in the same direction but have different wavelengths or frequencies. A complicated wave emerges as a result. When the wavelengths are slightly different, a throbbing frequency termed a beat emerges. Figures D, E, and F depict complex waves (solid lines) made up of two component interfering waves (dotted lines), with a wavelength to amplitude ratio of 1:2 and 1:3.

Priya R Nair

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