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    Baalkrishan Mani
    Baalkrishan Mani
    Asked: 3 years agoIn:

    एक लिफ्ट में खड़ा व्यक्ति एक सिक्के को हाथ से छोड़ता है | यदि लिफ्ट स्थिर रहे, तो सिक्का लिफ्ट के फर्श तक गिरने में `t_(1)` समय लेता है | परंतु, यदि लिफ्ट एकसमान वेग से चल रही हो, तो सिक्के को लिफ्ट के फर्श तक पहुँचने में `t_(2)` समय लगता है | सही विकल्प चुनें |
    A. `t_(1)=t_(2)`
    B. `t_(1) lt t_(2)`
    C. `t_(1) gt t_(2)`
    D. `t_(1)` तथा `t_(2)` में संबंध इस बात पर निर्भर करता है कि लिफ्ट ऊपर की ओर चल रही है या निचे की ओर

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    Baalkrishan Mani
    Baalkrishan Mani
    Asked: 3 years agoIn:

    Radioactive disintergation always follow `I` order kinetics and is independent of all external factors and is represented by the relation `N = N_(0) e^(-lambda t)` where `lambda` is decay constant and `N` atoms are left at time `t`. The radioactive nature of element is expressed in terms of average life numerically equal to decay constant `(1//lambda)` however all the radioactive do not lose their radioactive nature in thier average life. The radioactive emission involves `alpha, beta` particles as well as `gamma-` rays.The penertrating power order is `alpha lt beta lt gamma`. The emissions can perntrate even thick steel walls but are however unable to penttrate `Pb` blocks. The `S` unit fo rate of decay is `dps`.
    The completion of radioactive emission from a species takes place in:
    A. Average life
    B. Half-life
    C. `(1)/(2)xx`average life
    D. Infinity

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