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Question

একটি তেজস্ক্রিয় পদার্থের অর্ধায়ু 5 ঘন্টা । এর ক্ষয় ধ্রুবকের মান কত?

3.85 \times 10^{5} s^{- 1}

3.85 s^{- 1}

3.85 \times 10^{- 5} s^{- 1}

3.85 \times 10^{- 5} s^{- 1}

ANSWER : 3

Descrption

<p><span style = "color: #202124; font - family: arial, sans - serif; font - size: 16px; background - color: #ffffff;">T</span><sub style = "color: #202124; font - family: arial, sans - serif; background - color: #ffffff;">1</sub><sub style = "color: #202124; font - family: arial, sans - serif; background - color: #ffffff;">/</sub><sub style = "color: #202124; font - family: arial, sans - serif; background - color: #ffffff;">2</sub><span style = "color: #202124; font - family: arial, sans - serif; font - size: 16px; background - color: #ffffff;">  =  0.693/&lambda;</span></p>
<p><span style = "color: #202124; font - family: arial, sans - serif; font - size: 16px; background - color: #ffffff;">or, 5  = </span><span style = "color: #202124; font - family: arial, sans - serif; font - size: 16px; background - color: #ffffff;"> 0.693/&lambda;.</span></p>
<p><span style = "color: #202124; font - family: arial, sans - serif; font - size: 16px; background - color: #ffffff;">or, </span><span style = "color: #202124; font - family: arial, sans - serif; font - size: 16px; background - color: #ffffff;">&lambda;  =  5/</span><span style = "background - color: #ffffff; color: #202124; font - family: arial, sans - serif; font - size: 16px;">0.693  =  </span><span style = "color: #202124; font - family: arial, sans - serif;">3.85&times;10<sup> - 5 </sup>s<sup> - 1</sup></span></p>

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