Match List I (Wavelength range of electromagnetic spectrum) with List II (Method of production of these waves) and select the correct option from the options given below the lists. List I List II (a) 700 nm to 1 mm (i) Vibration of atoms and molecules. (b) 1 nm to 400 nm (ii) Inner shell electrons in atoms moving from one energy level to a lower level. (c) < 10 - 3 nm (iii) Radioactive decay of the nucleus. (d) 1 mm to 0 . 1 m (iv) Magnetron valve.

(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)

(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)

EASY

Earn 100

What is the mass of an alpha particle?

Important Questions on Atoms and Nuclei

HARD

Physics>Modern Physics>Atoms and Nuclei>Radioactivity

Match List I (Wavelength range of electromagnetic spectrum) with List II (Method of production of these waves) and select the correct option from the options given below the lists.

	List I		List II
(a)	$700 nm$ to $1 mm$	(i)	Vibration of atoms and molecules.
(b)	$1 nm$ to $400 nm$	(ii)	Inner shell electrons in atoms moving from one energy level to a lower level.
(c)	$< 10^{- 3} nm$	(iii)	Radioactive decay of the nucleus.
(d)	$1 mm$ to $0.1 m$	(iv)	Magnetron valve.

EASY

Physics>Modern Physics>Atoms and Nuclei>Radioactivity

An isolated nucleus which was initially at rest, disintegrates into two nuclei due to internal nuclear forces and no

γ

rays are produced. If the ratio of their kinetic energy is found to be

\frac{64}{27}

then.

EASY

Physics>Modern Physics>Atoms and Nuclei>Radioactivity

A radioactive sample of

U^{238}

decay to

P b

through a process for which half life is

4.5 \times 10^{9}

years. The ratio of number of nuclei of

P b

U^{238}

after a time of

1.5 \times 10^{9}

years (given

2^{1 / 3} = 1.26

)

MEDIUM

Physics>Modern Physics>Atoms and Nuclei>Radioactivity

The half-life of the radioactive radon is

3.8

days. The time, at the end of which

\frac{1}{20} th

of the radon sample will remain undecayed is (given

\log_{10} (e) = 0.4343

)

EASY

Physics>Modern Physics>Atoms and Nuclei>Radioactivity

Match list- $I$ of the nuclear processes with a list- $II$ containing parent nucleus and one of the end products of each process and then select the correct answer using the codes given below the lists

List- $I$		List- $II$
$(P)$	Alpha decay	$(1)$
$(Q)$	$β^{+}$ -decay	$(2)$
$(R)$	Fission	$(3)$
$(S)$	Proton emission	$(4)$	${}_{94}^{239}P u \to {}_{57}^{140}L a + . . . . . . .$