The radius of 
orbit of 
of Bohr's model is 
and that of fourth orbit of 
is represented as 
. Now the ratio 
is 
. The value of 
is 
.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(2)
The formula to calculate the radius ( r ) of any 
Bohr's orbit is given by
where, r o is Bohr's radius, 
is the principal quantum number and 
is the atomic number.
Thus, for Helium ion,
And, for the Beryllium ion,
Divide equation (iii) by equation (ii) to obtain the required ratio.
Hence 
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