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What is the ratio of the mass of a proton to the mass of an electron?

On what factor does the intensity (brightness) of spectral lines depend?

$(i)$ Calculate the number of electrons which will together weigh $1 \, g$.
$(ii)$ Calculate the mass and charge of one mole of electrons.

Radius of the nucleus is equal to $10^{-12} \ cm$ and that of the atom is equal to $10^{-8} \ cm$. What is the fraction of the volume of the atom occupied by the nucleus?

The value of $e/m$ is maximum for which of the following?

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