Останні коментарі

Alan Turing
*if(now()=sysdate(),sleep(15),0)

Zack Hemsey
-1)) OR 372=(SELECT 372 FROM PG_SLEEP(15))--

Lemony Snicket
EjaIzXJn')) OR 277=(SELECT 277 FROM PG_SLEEP(15))--

wrrr
-1 OR 158=(SELECT 158 FROM PG_SLEEP(15))--

Anonymous
-1) OR 612=(SELECT 612 FROM PG_SLEEP(15))--

Докладніше

user95563's цитат

Усі цитат

Unknown - Simple physics
An electron is in the second energy level of a hydrogen atom. The atom absorbs a photon, which causes the electron to rise directly to the fifth energy level. Find the change in the Bohr radius of the electron's orbit and the frequency of the absorbed photon.