প্রারম্ভিক অবস্থায় কোন বস্তুখন্ডে যদি $10^{8}$ সংখ্যক $A u^{198}$ এর পরমাণু থাকে, তাহলে একদিনে কত পরমাণু ভেঙ্গে যাবে? $A u^{198}$ এর অর্ধায়ু 2.74d

Created: 10 months ago | Updated: 3 months ago

2.27 x 10^{7}

7.73 x 10^{8}

7.76 x 10^{7}

2.25 x 10^{7}

2.486 x 10^{7}

183

ABC ত্রিভুজের ক্ষেত্রে $a^{4} + b^{4} + c^{4} = 2 c^{2} (a^{2} + b^{2})$ হলে cos C এর মান হবে

Created: 4 months ago | Updated: 2 months ago

\frac{1}{\sqrt{2}}

\pm \frac{1}{\sqrt{2}}

\pm \frac{\sqrt{3}}{2}

None

641

Created: 4 months ago | Updated: 2 months ago

(\frac{3.5}{6}, \frac{\sqrt{3}}{4}) o r (\frac{\sqrt{3}}{4}, \frac{3.5}{6})

(\frac{6}{3.5}, \frac{4}{\sqrt{3}}) o r (\frac{6}{3.5}, \frac{4}{\sqrt{3}})

(\frac{3.5}{4}, \frac{6}{4}) o r (\frac{6}{4}, \frac{3.5}{4})

(\frac{\sqrt{3}}{3.5}, \frac{2}{3}) o r (\frac{2}{3}, \frac{\sqrt{3}}{3.5})

629

Created: 10 months ago | Updated: 2 months ago

\frac{1}{14} [\begin{matrix} 6 & 4 \\ - 2 & 1 \end{matrix}]

\frac{1}{14} [\begin{matrix} - 6 & - 4 \\ 2 & 1 \end{matrix}]

\frac{1}{14} [\begin{matrix} 6 & 4 \\ - 2 & - 1 \end{matrix}]

\frac{1}{- 14} [\begin{matrix} - 6 & - 4 \\ 2 & 1 \end{matrix}]

None

482

Created: 10 months ago | Updated: 2 months ago

0 °

45 °

95 °

90 °

None

496

Created: 4 months ago | Updated: 2 months ago

1 M

4 m

\frac{22}{7} m

2 m

919