Question

2. A student passes light from a tube of hydrogen was passes light from a tube of hydrogen gas through a diffraction grating, resulting in discrete spectral lines. One of the lines has a wavelength of 186 nm with a width of 15 nm. This corresponde an energy and uncertainty of E = 2.55 +0.05 eV. Which transition between H energy levels could Produce this liner What energy is required to excite the hydrogen atom from the ground state In level that produces this transition? 3. A 850 kHz radio signal is detected at a point 2.8 km from the transmitter. Its electric field is measured to have a maximum value of 0.80 V/m. a. Write expressions for the E and B waves. b. Assuming the wave spreads uniformly and there are no reflections (the ground absorbs any wave incident on it), what is the intensity of the signal at this point?

Answer 1

n=5 n=4 n=3 - 0.5hher - 0.85eV -1.57ev N=2 DE=2.86 eV AE=2.55eV - 3. her n=1 - 13.6ev

Q2) The difference in energy levels should be 2.55 t 0.05 ev. As can be seen from the energy diagram, this can happen only for transition from n = 4 to n=2 En = 13.6-0.85 = 12.75 eV