Question 1. a) Which of the following transitions are allowed in the normal electronic emission spectrum of an atom: (i)

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Question 1 A Which Of The Following Transitions Are Allowed In The Normal Electronic Emission Spectrum Of An Atom I 1 (121.4 KiB) Viewed 23 times

Question 1. a) Which of the following transitions are allowed in the normal electronic emission spectrum of an atom: (i) 2s→1s, (ii) 2p→1s, (iii) 3d-2p? Justify your answers. b) When ultraviolet radiation of wavelength 58.0 nm from a helium lamp is directed on to a sample of krypton, electrons are ejected with a speed of 1.59×106 m s¹. Calculate the ionization energy of krypton. c) How many photons does a monochromatic infrared rangefinder of power 1.0×10-³ W and wavelength 1000 nm emit in 0.10s? d) To what speed must an electron be accelerated for it to have a wavelength of 100 pm? Rμhc == n² e) Bohr's energy equation for a H atom gives the energy of an electron in level n as: En Calculate, to four significant figures, the wavenumber of the first line (n₁=1, n₂=2) of the Lyman series for H.