English
Русский
Oʼzbek
Subjects
News and articles
About us
Career
Contacts
Profile
Watch history
My library
Notifications
Logout
Русский
Oʼzbek
Online Mektep
Authorization
Home
Subjects
School Subjects
Main
Subjects
School Subjects
Physics
Upper Secondary
20. Atomic physics
20. Atomic physics
100. External photoelectric effect
101. Emission and absorption spectra
102. Electron energy levels in an atom
103. X-rays
104. Waves of matter
99. Radiation of objects
