How many energy rays of $\alpha -$ particles emitted from $_{83}^{214}Bi$ were taken?
How many energy rays of $\alpha -$ particles emitted from $_{83}^{214}Bi$ were taken?
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In a Geiger-Marsden experiment, what is the distance of closest approach to the nucleus of a $7.7 \;MeV$ $\alpha -$particle before it comes momentarily to rest and reverses its direction?
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If in nature there may not be an element for which the principal quantum number $n > 4,$ then the total possible number of elements will be
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If the force between the electron in the first Bohr orbit and the nucleus (proton) in hydrogen atom is $F$, then the force between them when the electron is in the second orbit is
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To accommodate the view that matter is made up to $5$ elements only, a scientist proposed the following hypothesis; that atoms can have a maximum principal quantum number $n _{\operatorname{man}}$ and no higher. Then, which of the following statements must be true ?
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Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is
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