1.

Assertion : Radioactive heavy nuclei decay by a series of alpha- and //or beta-emission, to form a stable isotope of lead Reaosn : Radioactivity is a physical phenomenon

Answer»

If both ASSERTION and reason are true and the reason is the correct EXPLANATION of the assertion
If both assertion and reason are true but reason is not the correct EXPLANANTION of the assertion
If assertion is true but reason is false
If the assertion and reason both are false

Solution :At onetime, it was believed that actinium series starts with `Ac -227` but now it is well KNOWN that it starts with `U - 235 and Ac -227` is one of the main products


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