Physics-
General
Easy
Question
In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
- 3 : 4
- 1 : 3
- 9 : 4
- None of these
The correct answer is: 9 : 4
Using 
where 
. For parabolas to coincide in the two photographs, the 
should be same for the two cases. Thus, 
Þ 
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