CBSE Class 11 science: Planck's Quantum Theory Videos | Structure of Atom

• calculate the energy in electron volt for the photon of wavelength 310nm
• what will be the answer
  
• calculate the number of emitted per by a bulb 60 watt the wavelength of bulb 2000A
• what is science
  
• Why ionisation energy is always positive
• chemistry atomicstructure
  
• The wavelength of a spectral line for an electronic transition is inversely proportional to : (1) number of electrons undergoing transition (2) the nuclear charge of the atom (3) the velocity of an electron undergoing transition (4) the difference in the energy involved in the transition
• a photon of 3000 Angstrom is absorbed by a gas and then re-elected as two photons. One photon is red 7600  Angstrom  .  What wavelength of other photon?  Here I am knowing solution but I am not able to understand that why we are using formula ( h*c/lambda of total =  h*c/lambda of 1 +h*c / lambda of 2 ) Please solve it 
• Formula of energy
• Solved numerical s on Plank quantum theory?  

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