Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Environmental Science Environmental Chemistry

Which among the following radioactive species have a half life of more than 10 years?

(a) ₃₆Kr⁹¹

(b) ₃₈Sr⁹⁰

(c) ₅₅Cs¹³⁷

(d) ₄₀Zr⁹¹

Choose the correct option from those given below:

1

(a) and (c) only

2

(b) and (c) only

3

(a) and (d) only

4

(c) and (d) only

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