1010 = N*1/109
=>N = 1019
=>total mass = 10-25*1019 = 1mg
10) The activity of a freshly prepared radioactive sample is 1010 disintegrations per second, whose mean life is 109s. The mass of an atom of this radioisotope is 10-23 kg. The mass (in mg) of the radioactive sample is
Answer is:
1
Explanation:
Related General Physics MCQ with Answers
Answer is:
9
Explanation:
I = (4*2*MR2/5) + Ma2/2
=>N11*10-4
=> N=9
Answer is:
collision between fast neutrons and nitrogen nuclei present in the atmosphere
Explanation:
Fast moving neutron have a sufficient energy to penetrate the nitrogen nucleus and absorbedby it. Hence it make a intermdiate unstable element finallyit gives carbon-14 and a electron.
Answer is:
work done in rolling a stone is less than in lifting it
Explanation:
Work done in rolling is less than lifting due to a extra work has been done in lifting due to gravity means against the gravity but in rolling on a inclined plane we get a work done by gravity in downward direction along the gravity.
Answer is:
capillary action phenomenon
Explanation:
Blotting paper provide a capillary tube for ink so ink fill in capillary tube and absorbed by blotting paper continuously.