Why does 2s have less energy than 1s if they have the same principal quantum number? Updated 2025-07-16
The principal quantum number thing fully determining energy is only true for the hydrogen emission spectrum for which we can solve the Schrödinger equation explicitly.
For other atoms with more than one electron, the orbital names are just a very good approximation/perturbation, as we don't have an explicit solution. And the internal electrons do change energy levels.
Note however that due to the more complex effect of the Lamb shift from QED, there is actually a very small 2p/2s shift even in hydrogen.
X chromosome Updated 2025-07-16
Carbon-12 Updated 2025-07-16
Goiânia accident Updated 2025-07-16
OUTER JOIN Updated 2025-07-16
primes (bsdgames) Updated 2025-07-16
Reclaim the Streets Updated 2025-07-16
The best popular Brazilian music (MPB) of all time Updated 2025-07-16
It is such a huge shame that you have to understand Portuguese to appreciate those songs... this is yet another great evil outcome of having more than one natural language is bad for the world.
The good songs stopped before of just after Ciro Santilli was born, they were originally heard by his parent's generation. Those young new kids are boring.
The place to start is definitely the Holy Trinity of popular Brazilian music:
- Caetano Veloso is arguably Ciro Santilli's favorite MPB artist, he has just too many amazing songs, best ones at: Section "The best Caetano Veloso songs"
- Chico Buarque. Ciro's second favorite.
- Gilberto Gil. Perhaps Ciro likes him third because he is the most lighthearted one, although not always: Section "The best Gilberto Gil songs"
Video 1. Preciso Me Encontrar by Cartola. Source. Present in the 1976 eponymous album though it is likely from much earlier.Video 2. Asa Branca by Luiz Gonzaga. Source. Translation: "White wing". Written in 1947Video 3. O vento by Dorival Caymmi (1949)Source. Translation: "The wind".Video 4. Panis et Circenses from the Tropicália: ou Panis et Circencis ()Source. Translation: "Bread and circuses", a famous Latin phrase. Composed by Gilberto Gil and Caetano Veloso and performed by Os MutantesVideo 5. Mistério do Planeta from the Acabou Chorare album by Novos Baianos (1972)Source. Translation: "The mystery of the planet".Video 6. "Senhor Cidadão" from the Se O Caso É Chorar album by Tom Zé (1972)Source. Translation: "Mr. Citizen". This is likely reference to Military dictatorship in Brazil-lingo. This is an anti-Military dictatorship in Brazil song, appears to reuse terms used by the dictatorship propaganda in the song.Video 8. Romaria by Renato Teixeira. Source."Romaria" is the name of a type of Catholic peregrination.Video 9. Metamorfose ambulante by Raul Seixas (1973)Source. Translation: "Itinerant metamorphosis". From the album Krig-ha, Bandolo!Video 10. Ouro de tolo by Raul Seixas (1973)Source. Translation: "Fool's gold". This dude should be a scientist. But well, he went for mystic/artist. Close enough.Video 11. Gita by Raul Seixas (1974)Source. "Gita" must be a reference to the Bhagavad Gita. From the album: Gita.Video 12. Maluco beleza by Raul Seixas (1977)Source. From the album O Dia em que a Terra ParouVideo 13. A telicidade by Tom Jobim (1958)Source. Translation: "Happiness". Composed for the Black Orpheus (1958) film. "Tristeza não tem fim, felicidade sim" (Sadness never ends, but happiness does). The movie itself is OK. Appeals to Ciro's Buddhist sensibilities.Video 14. Chega de saudade by Tom Jobim. Source. Translation: "Enough longing".Video 15. Jorge da Capadócia by Jorge Ben Jor (1975)Source. From the Solta o Pavão (1975) album. The Caetano interpretation is better however, poor Jorge.- Jair Rodrigues
Video 16. Disparada by Jair Rodrigues (1968)Source. This song is simply amazing. Not exactly MPB, a bit more towards country, but close enough. This was as the track of some soap opera.Video 17. Deixa Isso Pra Lá by Jair Rodrigues (1964)Source. Fantastic early example of early rap music!!! This is regocnized example at: www.youtube.com/watch?v=jfnDEuuPq4Q which builds upon the 1964 song. Amazing. An amazing live performance at: www.youtube.com/watch?v=O3E1uHdrJws, only not using that as the default link as it is not from the official channel. - Vinicius de Moraes. Many of his lyrics are poetry. Notably, he has some "children" songs that you think about as an adult and go "oh fuck". For some reason, Ciro can't help but think that he looks like a pedophile, but he doesn't have any scandals apparently, poor dude. He was a drunkard for sure though.
Video 20. Aquarela by Toquinho (1983)Source. This is a mega childhood hit, and it never gets old. Amazing. One of the most brutal memento moris ever?Video 21. Xô Saudade by Alceu Valença. Source. From the 1980 album "Coração Bobo"Video 25. Na Rua, Na Chuva, Na Fazenda by Hyldon (1974)Source. Translation: "On the Street, In the Rain, On the Farm".Video 26. Tudo o que você podia ser from the Clube da Esquina album by Milton Nascimento (1972)Source.Translation: "All that you could be".
Carbon-13 Updated 2025-07-16
Cell wall Updated 2025-07-16
Circular chromosome Updated 2025-07-16
Connectome by species Updated 2025-07-16
ELEMENTARY (complexity) Updated 2025-07-16
Grid cell Updated 2025-07-16
How to Create a Mind Updated 2025-07-16
Key (cryptography) Updated 2025-07-16
List of British universities Updated 2025-07-16
Old Testament Updated 2025-07-16
Progressive rock Updated 2025-07-16
Theria subclade Updated 2025-07-16
Unlisted articles are being shown, click here to show only listed articles.