Some laws/processes are given in Column I. Match these with the physical phenomena given in Column II and indicate your answer by darkening appropriate bubbles in the 4 × 4 matrix given in the ORS. [2007]

Question

Some laws/processes are given in Column I. Match these with the physical phenomena given in Column II and indicate your answer by darkening appropriate bubbles in the 4 × 4 matrix given in the ORS. [2007]

	Column I		Column II
(A)	Transition between two atomic energy levels	(p)	Characteristic X-rays
(B)	Electron emission from a material	(q)	Photoelectric effect
(C)	Moseley's law	(r)	Hydrogen spectrum
(D)	Change of photon energy into kinetic energy of electrons	(s)	$β$ -decay

Smart Achievers · Accepted Answer

(4)

$A \to p, r$

The lines in the hydrogen spectrum are obtained due to the transition of electrons from one energy level to another. Characteristic X-rays are produced due to the transition of electrons from one energy level to another.

$B \to q, s$

In the photoelectric effect, electrons are emitted from the metal surface when light of appropriate frequency is incident on it.

In $β$ -decay, electrons are emitted from the nucleus of an atom.

$C \to p$

According to Moseley's law, the frequency of emitted X-rays is related to the atomic number $(z)$ of the target material as $\sqrt{ν} = a (Z - b)$

$D \to q$

According to Einstein's photoelectric equation, the energy of photons of the incident radiation is converted into the kinetic energy of emitted electrons. $K . E_{\max} = h ν - ϕ$

Solution

1 $A \to q; B \to p, r; C \to q, s; D \to p$

2 $A \to q; B \to p; C \to q, s; D \to p, r$

3 $A \to q; B \to q, s; C \to p; D \to p, r$

4 $A \to p, r; B \to q, s; C \to p; D \to q$

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Solution

1 A→q; B→p, r; C→q, s; D→p

2 A→q; B→p; C→q, s; D→p, r

3 A→q; B→q, s; C→p; D→p, r

4 A→p, r; B→q, s; C→p; D→q

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1 $A \to q; B \to p, r; C \to q, s; D \to p$

2 $A \to q; B \to p; C \to q, s; D \to p, r$

3 $A \to q; B \to q, s; C \to p; D \to p, r$

4 $A \to p, r; B \to q, s; C \to p; D \to q$