TS EAMCET 2020 (Online) 11th September Morning Shift | Atoms and Nuclei Question 79 | Physics

Let $G, W, E$ and $S$ be relative strength of gravitational, weak-nuclear, electromagnetic and strong-nuclear forces, respectively. Which of the correct statement?

$S>W>E>G$

$E>W>S>G$

$S>E>W>G$

$S>E>G>W$

TS EAMCET 2020 (Online) 11th September Morning Shift

MCQ (Single Correct Answer)

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In the Bohr model an electron of mass $m$ moves in a circular orbit around the proton. Considering the orbiting electron to be a circular current loop, the magnetic moment of the hydrogen atom, when the electron is in $n$th excited state. (Assume, $h=$ Planck's constant)

$\left(\frac{e}{2 m} \frac{n^2 h}{2 \pi}\right)$

$\left(\frac{e}{m}\right) \frac{n h}{2 \pi}$

$\left(\frac{e}{2 m}\right) \frac{n h}{2 \pi}$

$\left(\frac{e}{m}\right) \frac{n^2 h}{2 \pi}$

TS EAMCET 2020 (Online) 11th September Morning Shift

MCQ (Single Correct Answer)

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A radioactive element which can decay by two processes, has half-life $t_1$ for first process and half-life $t_2$ for second process. Let $\langle t\rangle$ be the effective average-life of this element. Which of the following is correct?

$\langle t\rangle<\frac{t_1 t_2}{t_1+t_2}$

$\langle t\rangle=\frac{t_1 t_2}{t_1+t_2}$

$\langle t\rangle>\frac{t_1 t_2}{t_1+t_2}$

$\langle t\rangle=\ln 2\left(\frac{t_1+t_2}{t_1 t_2}\right)$

TS EAMCET 2020 (Online) 10th September Evening Shift

MCQ (Single Correct Answer)

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In atomic scale the weakest force in nature is

strong force

electromagnetic force

gravitational force

weak force

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