Q. A sample of a radioactive substance undergoes 80% decomposition in 345 minutes it's half life is ____ minutes 1. ln 2/ ln 5 345 2. ln 5/ ln 2 345 3. ln 5/ ln 4 345 4. ln 4/ ln 5 345

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g m

s

g m

l n (3)

l n (2)

\int_{2}^{5} (ln x)dx

700 s^{- 1}

500 s^{- 1}

30

(Take ln 2 = 0.693 and ln 1.4 = 0.336)

a \neq 1

l n a^{2} + {(l n a^{2})}^{2} + {(l n a^{2})}^{3} + . . . . . . . . = 3 (l n a + {(l n a)}^{2} + {(l n a)}^{3} + {(l n a)}^{4} + . . . . . .)

a

f (x) = \frac{l n (l n x)}{l n x}

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