VITEEE 2022 | Atoms and Nuclei Question 6 | Physics

The half-life period of a radioactive element $$x$$ is same as the mean life time of another radioactive element $$y$$. Initially, both of them have the same number of atoms. Then,

$$x$$ and $$y$$ have the same decay rate initially

$$x$$ and $$y$$ decay at the same rate always

$$y$$ will decay at a faster rate than $$x$$

$$x$$ will decay at a faster rate than $$y$$

VITEEE 2021

MCQ (Single Correct Answer)

-0

Polonium has a half-life of 140 days. If we take $$20 \mathrm{~g}$$ of polonium initially then the amount of it that remains after 280 days is

2.5 g

5 g

10 g

15 g

VITEEE 2021

MCQ (Single Correct Answer)

-0

According to Bohr model of hydrogen atom, only those orbits are permissible which satisfy the condition

$$m v=n h$$

$$\frac{m v^2}{r}=n\left(\frac{h}{2 \pi}\right)$$

$$m v r=n\left(\frac{h}{2 \pi}\right)$$

$$m v r^2=n\left(\frac{h}{2 \pi}\right)$$

VITEEE 2021

MCQ (Single Correct Answer)

-0

The Rutherford scattering experiment proves that an atom consists of

a sphere of positive charge in which electrons are embedded like seeds of water-melon

a sphere of negative charge in which protons are embedded like seeds of water-melon

a sphere of electron cloud in which the positive charge in placed at the centre of the sphere

a sphere of neutral charge

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