JEE MAIN 2022 ONLINE 26TH JUNE EVENING SHIFT

A radioactive nucleus can decay by two different processes. Half-life for the first process is 3.0 hours while it is 4.5 hours for the second process. The effective half-life of the nucleus will be:

The role of depressants in 'Froth Flotation method' is to

If \(A = \sum\limits_{n = 1}^\infty {{1 \over {{{\left( {3 + {{( - 1)}^n}} \right)}^n}}}}\) and \(B = \sum\limits_{n = 1}^\infty {{{{{( - 1)}^n}} \over {{{\left( {3 + {{( - 1)}^n}} \right)}^n}}}}\), then \({A \over B}\) is equal to :

The positive feedback is required by an amplifier to act an oscillator. The feedback here means :

s-block element which cannot be qualitatively confirmed by the flame test is :

If the lines \(\overrightarrow r = \left( {\widehat i - \widehat j + \widehat k} \right) + \lambda \left( {3\widehat j - \widehat k} \right)\) and \(\overrightarrow r = \left( {\alpha \widehat i - \widehat j} \right) + \mu \left( {2\widehat i - 3\widehat k} \right)\) are co-planar, then the distance of the plane containing these two lines from the point (\(\alpha\), 0, 0) is :