Recommended PYQs (STRICTLY NCERT Based) Dual Nature of Radiation and Matter Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

If $c$ is the velocity of light in free space, the correct statements about photons among the following are:

(A)	The energy of a photon is $E=h\nu.$
(B)	The velocity of a photon is $c.$
(C)	The momentum of a photon, $p={\dfrac{h\nu}{c}}.$
(D)	In a photon-electron collision, both total energy and total momentum are conserved.
(E)	Photon possesses a positive electric charge.

Choose the correct answer from the options given below:

1.	(A), (B), (C) and (D) only
2.	(A), (C) and (D) only
3.	(A), (B), (D) and (E) only
4.	(A) and (B) only

Subtopic: Particle Nature of Light |

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Q2:

The graph that shows the variation of

\frac{1}{λ^{2}}

${\dfrac{1}{\lambda^2}}$ with the kinetic energy

E

$E$ (where

λ

$\lambda$ is the de-Broglie wavelength of a free particle) is:

1.		2.
3.		4.

Subtopic: De-broglie Wavelength |

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Q3:

Radiation of wavelength

280 nm

$280~\text{nm}$ is used in an experiment of photoelectric effect with cathode of work function,

2.5 eV .

$2.5~\text{eV}.$ The maximum kinetic energy of the photoelectrons is:
(take

h = 6.62 \times 10^{- 34} J s

$h=6.62\times10^{-34}~\text{J s}$ and

c = 3 \times 10^{8} {ms}^{- 1}

$c=3\times10^{8}~\text{ms}^{-1}$ )

1.	$4.4~\text{eV}$	2.	$7.103\times10^{-15}~\text{J}$
3.	$1.9~\text{eV}$	4.	$4.60~\text{eV}$

Subtopic: Einstein's Photoelectric Equation |

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Q4:

Given below are two statements:

Statement I:	The de Broglie wavelength associated with a material particle depends on its charge and nature.
Statement II:	The wave nature of particles in sub-atomic domain is significant and measurable.

In the light of the above statements, choose the most appropriate answer from the options given below:

1.	Both Statement I and Statement II are correct.
2.	Both Statement I and Statement II are incorrect.
3.	Statement I is correct but Statement II is incorrect.
4.	Statement I is incorrect but Statement II is correct.

Subtopic: De-broglie Wavelength |

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Q5:

An electron and an alpha particle are accelerated by the same potential difference. Let

λ_{e}

$\lambda_\mathrm{e}$ and

λ_{α}

$\lambda_\mathrm{\alpha}$ denote the de-Broglie wavelengths of the electron and the alpha particle, respectively, then:

1.	$\lambda_{\mathrm{e}}>\lambda_{\alpha}$	2.	$\lambda_{\mathrm{e}}=4\lambda_{\alpha}$
3.	$\lambda_{\mathrm{e}}=\lambda_{\alpha}$	4.	$\lambda_{\mathrm{e}}<\lambda_{\alpha}$

Subtopic: De-broglie Wavelength |

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Q6:

If

ϕ

$\phi$ is the work function of photosensitive material in electron-volts and light of a wavelength of numerical value

λ = \frac{h c}{e}

$\lambda=\dfrac{{hc}}{{e}}$ metres is incident on it with energy above its threshold value at an instant, then the maximum kinetic energy of the photo-electron ejected by it at that instant is (in SI units):
(take

h

$h$ as Plank's constant and

c

$c$ as the velocity of light in free space)
1.

e + 2 ϕ

${e}+2\phi$
2.

2 e - ϕ

$2{e}-\phi$
3.

e - ϕ

${e}-\phi$
4.

e + ϕ

${e}+\phi$

Subtopic: Einstein's Photoelectric Equation |

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Q7:

The work functions of Caesium

(C s),

$(\mathrm{Cs}),$ Potassium

(K),

$(\mathrm{K}),$ and Sodium

(N a)

$(\mathrm{Na})$ are

2.14 eV,

$2.14~\text{eV},$

2.30 eV

$2.30~\text{eV}$ and

2.75 eV

$2.75~\text{eV}$ respectively. If incident electromagnetic radiation has an incident energy of

2.20 eV,

$2.20~\text{eV},$ which of these photosensitive surfaces may emit photoelectrons?

1.	$\mathrm{Na}$ only	2.	$\mathrm{Cs}$ only
3.	both $\mathrm{Na}$ and $\mathrm{K}$	4.	$\mathrm{K}$ only

Subtopic: Photoelectric Effect: Experiment |

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Q8:

The de-Broglie wavelength associated with an electron, accelerated by a potential difference of

81

$81$ V is given by:
1.

13.6

$13.6$ nm
2.

136

$136$ nm
3.

1.36

$1.36$ nm
4.

0.136

$0.136$ nm

Subtopic: De-broglie Wavelength |

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Q9:

The maximum kinetic energy of the emitted photoelectrons in the photoelectric effect is independent of the:

1.	work function of material
2.	intensity of incident radiation
3.	frequency of incident radiation
4.	wavelength of incident radiation

Subtopic: Photoelectric Effect: Experiment |

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Q10:

When two monochromatic lights of frequency,

ν

$\nu$ and

\frac{ν}{2}

$\dfrac{\nu}{2}$ are incident on a photoelectric metal, their stopping potential becomes

\frac{V_{s}}{2}

$\dfrac{V_{s}}{2}$ and

V_{s}

$V_s$ , respectively. The threshold frequency for this metal is:

1.	$\dfrac{3}{2} \nu$	2.	$2\nu$
3.	$3\nu$	4.	$\dfrac{2}{3} \nu$

Subtopic: Einstein's Photoelectric Equation |

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