I read that in 1986 Voyager 2 measured the composition of Uranus' atmosphere, which turned out to be composed of $85 \%$ hydrogen and $15 \%$ helium. It's not clear to me how this relevant amount of He can be present. The force of gravity on Uranus ($8.69 \space \rm m/s^2$) is lower than that mea...

In an infinite square well, potential energy is given below, why is the probability of finding a particle in the position of infinite potential energy zero? $$V(x)=\begin{cases} 0,& \text{if } x \ \text{in}\ (-a,a) \\ \infty, & \text{otherwise} \end{cases}$$ The usual explanat...

I have a very naive question, actually someone asked it and I can't answer. It simply asks that if gravitational energy cannot be localised (we cannot write a pure gravitational energy momentum tensor) then how do gravitational waves carry energy? I realised I do not understand gravitational wave...

I've been studying the interference phenomena observed in the double-slit experiment and came across a concept that piqued my interest. It is well understood that for interference patterns to form, the overlapping waves (or photons) must exhibit a degree of coherence. However, the underlying quan...