Pritha Mukherji
From the blaring brass in Inception to the soft piano and strings in Interstellar, sound has played a key role in every Christopher Nolan movie ever. In the case of Oppenheimer, however, the sound is the skeleton of the film.
The iterations of what can be termed as the love theme of Oppenheimer and quantum physics are irregularly interrupted by his visions of an atom splitting and the massive consequences it can bring, or even something as "harmless" as a ripple effect caused by a raindrop.
Even when the preparations start for the Manhattan Project, the glorious strings are met with discordant notes and blaring horns, literally implying that they were playing with fire.
Probably one of the best uses of sound in the movie is during the scene when Oppenheimer addresses the crowd after the Hiroshima and Nagasaki bombings.
This plays a key role in the final atomic bomb explosion we see in the test. As per the laws of physics, light travels faster than sound, which is why there is a slight delay in the sound of the explosion reaching the spectators.