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1
VITEEE 2021
MCQ (Single Correct Answer)
+1
-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

A
2.5 g
B
5 g
C
10 g
D
15 g
2
VITEEE 2021
MCQ (Single Correct Answer)
+1
-0

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

A
$$m v=n h$$
B
$$\frac{m v^2}{r}=n\left(\frac{h}{2 \pi}\right)$$
C
$$m v r=n\left(\frac{h}{2 \pi}\right)$$
D
$$m v r^2=n\left(\frac{h}{2 \pi}\right)$$
3
VITEEE 2021
MCQ (Single Correct Answer)
+1
-0

The Rutherford scattering experiment proves that an atom consists of

A
a sphere of positive charge in which electrons are embedded like seeds of water-melon
B
a sphere of negative charge in which protons are embedded like seeds of water-melon
C
a sphere of electron cloud in which the positive charge in placed at the centre of the sphere
D
a sphere of neutral charge
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