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QAIPMT-2011-Ph-1918: NEET 2011 Physics - Class 12 AIPMT-2011-Ph-1918 Solution: A charge Q is enclosed by a Gaussian spherical surface of…
A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled then the outward electric flux will increase four times be reduced to half remain the same be doubled
Multiple Choice Options
- A 10 microgram
- B 20 microgram
- C 40 microgram
- D 1 microgram
Step-by-Step Verified Solution
From Einstein relation, E = mc 2
Rearranging, m = E c 2
We see that mass decay per second :
d m d t = 1 c 2
_ d E d t = 1000 _ 10 3 ( 3 _ 10 8 ) 2
Now mass decay of U 235 per hour,
= d m d t _ 60 _ 60
= 1000 _ 10 3 ( 3 _ 10 8 ) 2 _ 3600
= 4 _ 10 �8 kg = 40 microgram