Quantum mechanics

can you explain me in detail

Angular momentum plays a central role in both classical and quantum mechanics. In classical mechanics, all isolated systems conserve angular momentum (as well as energy and linear momentum); this fact reduces considerably the amount of work required in calculating trajectories of planets, rotation of rigid bodies, and many more. Similarly, in quantum mechanics, angular momentum plays a central role in under- standing the structure of atoms, as well as other quantum problems that involve rotational symmetry. Like other observable quantities, angular momentum is described in QM by an operator. This is in fact a vector operator, similar to momentum operator. However, as we will shortly see, contrary to the linear momentum operator, the three components of the angular momentum operator do not commute.

hope you got it my point dear

dear see this cmnt.. it's very helpful for you

you are saying particle is moving orbit so it gives rise to orbital angular momentum but that is wrong

because in quantum mechanics if particle is moving in orbit then its position and momentum can be measured very accurately that is not true for quantum particle

because incase quantum particle unlike classical particle there is uncertainty in its position

dear i 9 it....but plz listen me

moment means what....mass effect of particle......orbital motion gives rise to orbital angular momentum and spin motion give rise to spin angular momentum. uncertainty is appears when we measure them. we can not simultaneously measure them accurately but it doesn't mean there is no orbital and spin angular momentum.they are there but due to limitations of our world and apparatus we can't measure them preciously

dear please watch the lecture by professor hc verma on youtube(in 3 dimension) then you might come to know what i m trying to ask you

dear i hv already watched series of sir hc verma lectures.....but plz tell me your question again what actually u wanna ask

what is the physical significance of orbital angular momentum

in quantum mechanics

it shows space quantization

shows any arbitrary orientation is not possible.