Question

a. Compare the following absorption spectra for an unknown element to the emission spectra for known elements. UNKNOWN ABSORPTION SPECTRA 19 wavelength, A (nm) KNOWN EMISSSION SPECTRA (Na) Sodium (H) Hydrogen (Ca) Calelum (Mg) Magnesium (Ne) Neon b) Identify the unknown element

Answer 1

b) The unknown element is Hydrogen.

Question 20 b) These lines emit visible radiation (VIBGYOR spectrum of electromagnetic radiation).

Question 22.c) The w avelength of highest energy line a=410 nm ( According to Planck's theory, energy a encs t wavelength Now, for electromagnetic radiation, [e=v2] ; c = speed of light 1 - so, 3.00 x 108 m/s = 0 x 410 x 109 m = Frequency, v = 3.00 x 108 m/s Чlo X 10-15 м 17:32 × 10 14 st