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Structure Of Atom

Question

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When white light that has passed through sodium vapours in viewed through a spectroscope, the observed spectrum has dark line at 5890Å. Explain this observation.

Solution

This indicates that the radiation corresponding to the wavelength 5890Å is absorbed from white light by sodium atoms for the excitation of electrons. The missing radiations appear as dark line in the emission spectra.

Some More Questions From Structure of Atom Chapter

What is a neutron?

What is the name of the remaining part of atom except outer orbit?

Name the particles which determine the mass of an element.

What are α-particles?

Why were neutrons discovered very late?

What are the fundamental particles present in a neutral atom having atomic number greater than 1?

Do protons and neutrons have identical mass?

When α-particles are sent through a thin metal foil, most of them go straight through the foil. What inference do you draw from it?

What did Rutherford's experiment on scattering of particles show for the first time?

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