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NEET • PHYSICS • DUAL NATURE OF RADIATION AND MATTER

Dual nature of radiation and matter practice · Mixed difficulty

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121 Medium

121 of 130

Analyzing +4 | -1

Assertion: In process of photoelectric emission, all emitted electrons do not have same kinetic energy.

Reason: If radiation falling on photosensitive surface of a metal consists of different wavelength then energy acquired by electrons absorbing photons of different wavelengths shall be different.

View answer and explanation

Correct option: B

Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Option B (Assertion is correct, reason is correct; reason is not a correct explanation for assertion) is correct because both statements are true, but the reason doesn't directly explain the assertion.

122 Easy

122 of 130

Application +4 | -1

A particle at rest disintegrates into two fragments of masses in the ratio of 1: 2 having non-zero velocities. The ratio of the de-Broglie wavelength of the lighter particle to that of the heavier particle is

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Correct option: A

Option A (1) is correct because, due to conservation of momentum, the magnitudes of the momenta of the two fragments are equal, resulting in equal de Broglie wavelengths.

123 Easy

123 of 130

Understanding +4 | -1

Statement-1: Photoelectric effect establishes quantum nature of light.
Statement-2: There is negligible time lag between photon collisions with the material and photoelectron emission irrespective of intensity of incident light. (Assume incident light is of frequency greater than threshold frequency of the material).

View answer and explanation

Correct option: A

Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1

Option A (Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1) is correct because the instantaneous emission of photoelectrons, regardless of intensity, demonstrates the particle nature of light.

124 Medium

124 of 130

Understanding +4 | -1

The work function of a metal is

{W_0}

and

\lambda

is wavelength of incident radiation. There is no emission of photoelectron when

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Correct option: D

\lambda > \frac{{hc}}{{{W_0}}}

Option D (

\lambda > \frac{{hc}}{{{W_0}}}

) is correct because for no photoemission to occur, the wavelength of the incident radiation must be greater than the threshold wavelength.

125 Medium

125 of 130

Analyzing +4 | -1

While doing his experiment, Millikan one day observed the following charges on a single drop
(i)

6.563 \times {10^{ - 19}}C

(ii)

8.204 \times {10^{ - 19}}C

(iii)

11.50\; \times {10^{ - 19}}C\;

(iv)

13.13 \times {10^{ - 19}}C

(v)

16.48 \times {10^{ - 19}}C\;\;

(vi)

18.09 \times {10^{ - 19}}C

From this data the value of the elementary charge

\left( e \right)

was found to be

View answer and explanation

Correct option: A

1.641 \times {10^{ - 19}}C

Option A (

1.641 \times {10^{ - 19}}C

) is correct because it is the approximate elementary charge found by calculating the greatest common divisor of the observed charges.

126 Medium

126 of 130

Application +4 | -1

The temperature at which protons in proton gas would have enough energy to overcome Coulomb barrier of

4.14 \times {10^{ - 14}}

J is (Boltzmann constant
=1.38

\times {10^{ - 23}}\;\mathrm{J}{\mathrm{K}^{ - 1}})\mathrm{\;}

View answer and explanation

Correct option: A

2 \times {10^9}

Option A (

2 \times {10^9}

K) is correct because it is calculated using the formula

E = \frac{3}{2}kT

127 Medium

127 of 130

Remembering +4 | -1

Which of the following is not the property of a cathode ray

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Correct option: D

It does not deflect in electric field

Option D (It does not deflect in electric field) is correct because cathode rays are streams of electrons, which are negatively charged particles, and thus deflect in an electric field.

128 Medium

128 of 130

Remembering +4 | -1

Positive rays were discovered by

View answer and explanation

Correct option: B

Goldstein

Option B (Goldstein) is correct because Eugen Goldstein is credited with the discovery of positive rays (also known as canal rays).

129 Medium

129 of 130

Understanding +4 | -1

When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photoelectrons to be ejected, it may consist of

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Correct option: B

X-rays

Option B (X-rays) is correct because X-rays have higher energy and frequency than ultraviolet radiation, allowing them to eject photoelectrons when UV radiation fails.

130 Medium

130 of 130

Application +4 | -1

Two identical metal plates shown photoelectric effect by a light of wavelength

\lambda \mathop A\limits^ \circ

falls on plate A and

{\lambda _B}

on plate

B\left( {{\lambda _A} = 2{\lambda _B}} \right).

The maximum kinetic energy is

View answer and explanation

Correct option: B

{K_A} < {K_B}/2

Option B (

{K_A} < {K_B}/2

) is correct because the kinetic energy is inversely proportional to the wavelength, and the wavelength of A is twice that of B.

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