CBSE Class 11-science Chemistry Spectrum

• 46tth question is my doubt please help.me
  
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• The frequency of the radiation emitted when electron falls from infinity to n=1 state for he+ would be
• Kinetic energy of an electron emitted when radiation of frequency v= 1.25 x10^15 strikes the metal surface whose threshold frequency v0 = 7.25 x 10^14 is
• Name the first five series of lines that occur in the atomic spectrum of hydrogen. Indicate the region in the electromagnetic spectrum where these series occur, and give a general equation of for the wavenumber applicable to all the series.
• Find the number of spectral lines obtained when electron de-excites from 5th to the 1st energy level but no line is seen in balmer series ?
• 10?
  
• 9?
• What do you mean by spectra? What are the basic types of spectra?
• How are emission, absorption and continuous spectra different?

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