Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following statements are incorrect? (1) Nuclear isomers contain the same number of protons and neutrons (2) One curie\[=3.7\times {{10}^{10}}\]disintegrations/per minute (3) The decay constant is independent of the amount of the susbtance taken (4) Actinium series starts with U-238A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: C
Solution :
1 Curie\[=3.7\times {{10}^{10}}d{{s}^{-1}}\] Actinium series starts with U - 235.
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