The frequency of D-line in the spectrum of sodium is 5.09 x 1014s-1. Calculate the wavelength of light.
Frequency of radiation
= 5.09 x 1014 s-1
Velocity of light = 3 x 108 ms-1
We know, 
or 
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?
What is Plum-Pudding model of the atom?
Are neutrons present in all atoms?
Why are electrons called planetary electrons?
What are nucleons?
When is the number of protons and electron same in an atom?
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