KVPY Government Jobs Exams

An unpolarized beam of light of intensity I0 passes through two linear polarizers making an angle of 30º with
respect to each other. The emergent beam will have an intensity

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KVPY Other Question

A parent nucleus X is decaying into daughter nucleus Y which in turn decays to Z. The half lives of X and Y are
40000 years and 20 years respectively. In a certain sample, it is found that the number of Y nuclei hardly changes
with time. If the number of X nuclei in the sample is 4 × 1020, the number of Y nuclei present in its is Among the following, the species with the highest bond order is –
(A) O2 (B) F2 (C) O2
+ (D) F2